How Long After Failed Implantation Will Period Start?


The process of conception and pregnancy is complex and delicate. After fertilization, the next important step is the implantation of the embryo into the lining of the uterus. However, not all implantation attempts are successful, which is known as failed implantation.

Menstrual Cycle Basics

A. Overview of the Menstrual Cycle: 

The menstrual cycle is a natural, recurring process that occurs in women of reproductive age. It involves a series of hormonal and physiological changes that prepare the body for a potential pregnancy. The average length of a menstrual cycle is typically around 28 days, but it can vary from person to person.

B. Phases of the menstrual cycle:

  • Menstrual phase:
      • The menstrual phase marks the beginning of the cycle and is characterised by the shedding of the uterine lining.
      • It typically lasts for 3 to 7 days, but the duration can vary.
      • Menstruation occurs when the levels of oestrogen and progesterone drop, causing the endometrium (uterine lining) to shed.
  • Follicular phase:
      • The follicular phase begins immediately after menstruation and lasts approximately 10 to 14 days.
      • During this phase, the pituitary gland releases follicle-stimulating hormone (FSH), which stimulates the development of ovarian follicles.
      • These follicles contain immature eggs, and as they grow, they produce oestrogen, which helps thicken the uterine lining.
  • Ovulation:
      • Ovulation usually occurs around the midpoint of the menstrual cycle, approximately 14 days before the start of the next menstrual period.
      • A surge in luteinizing hormone (LH) triggers the release of a mature egg from the dominant ovarian follicle.
      • The egg is then available for fertilisation for about 12 to 24 hours.
  • Luteal phase:
    • The luteal phase begins after ovulation and lasts approximately 12 to 16 days.
    • After the egg is released, the ruptured follicle transforms into the corpus luteum, which produces progesterone.
    • Progesterone prepares the uterine lining for the potential implantation of a fertilised egg.

C. Hormonal fluctuations:

Throughout the menstrual cycle, various hormones, such as oestrogen, progesterone, FSH, and LH, fluctuate in levels, orchestrating the changes in the uterine lining and the release of the egg.

Understanding these phases and hormonal fluctuations is essential for comprehending the relationship between failed implantation and the subsequent onset of the menstrual period. In the following sections, we will explore the process of implantation and how it relates to the menstrual cycle.

Implantation Process

A. Explanation of Implantation: 

Implantation is a crucial step in the process of pregnancy. After fertilisation, when the sperm and egg merge to form a zygote, the resulting embryo undergoes several divisions as it travels through the fallopian tube towards the uterus. Around 6-7 days after fertilisation, the embryo reaches the uterus and begins the process of implantation.

B. Factors affecting successful implantation:

The successful implantation of an embryo depends on various factors, including:

  1. Embryo quality: The quality of the embryo plays a significant role in successful implantation. Embryos with proper cell division, good morphology, and chromosomal health have a higher chance of implanting successfully.
  2. Uterine lining: The endometrium, or uterine lining, undergoes changes during the menstrual cycle to prepare for implantation. An optimal uterine lining with adequate thickness, receptive characteristics, and proper blood flow provides a favourable environment for the embryo to implant.
  3. Hormonal balance: Hormones like oestrogen and progesterone play crucial roles in preparing the uterus for implantation. Imbalances in these hormones can affect the receptivity of the uterine lining and hinder successful implantation.

Understanding these factors can help individuals and healthcare providers identify potential issues that may lead to failed implantation. The next section will explore the timeline of failed implantation and its impact on the menstrual cycle.


Failed Implantation and Menstruation

A. Relationship between failed implantation and the menstrual cycle:

Failed implantation refers to the inability of an embryo to successfully attach and implant into the uterine lining. When implantation fails, it triggers a series of hormonal changes that ultimately lead to the onset of menstruation.

B. Timeframe for failed implantation to trigger menstruation:

  1. Typical menstrual cycle length: In a typical 28-day menstrual cycle, failed implantation generally leads to the onset of menstruation around 14 days after ovulation. However, it’s important to note that menstrual cycle lengths can vary, and individual variations may exist.
  2. Effects of failed implantation on the menstrual cycle: If implantation is unsuccessful, hormone levels, particularly progesterone, decline. This drop in progesterone signals the body to shed the uterine lining, resulting in menstruation.
  3. Variation and timing: The timing of menstruation following failed implantation can vary. It may occur slightly earlier or later, depending on individual hormonal fluctuations and the specific circumstances surrounding implantation failure.

It’s worth noting that not all cases of failed implantation are easily discernible. In some instances, failed implantation may go unnoticed, as early pregnancy loss can occur before a person realises they are pregnant.

Understanding the relationship between failed implantation and menstruation can provide insights into reproductive health and fertility. However, it’s important to consider other factors that can influence the menstrual cycle, which will be discussed in the next section.

Other Factors Affecting Menstrual Cycle

A. Pregnancy:

  1. Pregnancy symptoms: In some cases, failed implantation may not lead to menstruation as expected. If successful implantation occurs, pregnancy can ensue, and the individual may experience early pregnancy symptoms such as missed periods, breast tenderness, nausea, and fatigue.
  2. Delayed menstruation due to pregnancy: When a fertilised egg implants successfully, the body produces human chorionic gonadotropin (hCG), a hormone detected in pregnancy tests. Elevated levels of hCG can delay the onset of menstruation.

B. Stress and emotional factors: 

Stress, anxiety, and emotional factors can influence the menstrual cycle. High levels of stress can disrupt hormone production and affect the regularity and timing of menstruation.

C. Hormonal disorders and medical conditions: 

Various hormonal disorders and medical conditions can impact the menstrual cycle. Conditions such as polycystic ovary syndrome (PCOS), thyroid disorders, and reproductive disorders can cause irregular menstrual cycles, delayed periods, or even amenorrhea (absence of menstruation).

Understanding these additional factors that can affect the menstrual cycle is crucial when evaluating the causes of delayed menstruation or failed implantation.


This article aims to shed light on this topic, providing an insight into how long after implantation failure one can expect the onset of menstruation. By delving into the basics of the menstrual cycle, the process of implantation, and the various factors that can affect the timing, we can gain a clearer understanding of this aspect of reproductive health.

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