When Does Implantation Occur?

So, you’re trying to conceive. Apart from getting busy under the sheets, you must also be trying to spot the days your most fertile days and ovulation. Questions like ‘When does implantation occur?’ might too be bothering you.

The most fertile days of a woman occur mid-cycle during ovulation. This is when conception has high chances of happening.

If fertilization has occurred then the next major phase is implantation. It is essential for a woman to know the duration and importance of the period. The elaborate signs associated with implantation are equally crucial.

If you know your cycle well, then chances of getting pregnant in the nearest cycle increase.

When Does Ovulation Occur?

Ovulation is the process in which a mature egg is released from the ovary into the Fallopian tube from where it starts to go towards the uterus. Generally, ovulation occurs mid-way through a woman’s menstrual cycle.

To determine when does ovulation occur, you should subtract 12 to 10 days from your menstrual cycle length. Most probably, your ovulation will start around these dates.

So for a woman with a normal 28-day cycle, ovulation can occur anytime between 12 to 17 days. This will vary with each woman as the duration of a cycle varies with each.

When Does Fertilization Occur?

Once the ovulation starts, the egg (ovum) is released into the Fallopian tube. The ovum is up for fertilization with a sperm for 12-24 hours only. If the sperm manages to reach Fallopian tube and penetrate the egg during this period, the egg fertilizes. Once a single sperm has penetrated, egg changes itself immediately to block other sperm from entering. This fertilized egg is now called zygote. Couples should try to time their efforts to conceive during this window to increase their chances. 

When does implantation occur?
When does implantation occur?

When does implantation occur?

After fertilization, the next big stage is the implantation. It is the start of a very exciting journey called motherhood. The fertilized ovum embeds itself into the wall of the uterus. This is known as implantation.

How long after ovulation does implantation occur? Implantation of a fertilized ovum can occur within 6-12 days. Usually, implantation occurs on the 9th day after ovulation.

How long does implantation take? The Zygote’s journey from the Fallopian tube to the uterus takes 6-7 days.

During the first 3 days, it develops in the Fallopian tube and then enters the uterus. By the 5th day, it gets transformed from a Zygote to a Morula to a Blastocyst.

For the next 2-3 days, blastocyst readies itself for implantation. As soon as implantation occurs, a hormone called Human Chorionic Gonadotropin starts producing. It is most commonly known as hCG. When one takes a pregnancy test, this hormone is detected in the urine.

How does the uterus prepare itself for implantation?

The uterus undergoes a series of processes to prepare itself for the blastocyst (a bunch of your baby’s first cells).

The blastocyst has to attach to the wall of the womb and remain attached there until birth.

Endometrium (womb lining) is not always viable for attachment with the embryo. Due to internal changes, it becomes suitable for adhesion but just for a fixed period known as its window period.

The window period lasts from 6 days to 12 days after ovulation. The internal changes taking place in the uterus are:

  • The endometrium begins to thicken and expand due to rise in the level of estrogen before ovulation.
  • After the release of progesterone, a process named Decidualization takes place.
  • In Decidualization, white blood cells gather around arterioles and capillary (blood veins).
  • Endometrium starts to swell because of accumulation of interstitial fluid.
  • hCG hormone increases the blood supply in the uterus.
  • All these factors together provide a hospitable environment for the blastocyst.
  • But there are still chances of implantation not occurring. If such is the case, then endometrium breaks down and sheds along with the blastocyst (spontaneous miscarriage). Some women might mistake it for menses.

Implantation Symptoms: What are the signs of implantation?

Some embryos fail to implant, and the others implant beautifully. These signs help us to conclude whether implantation has occurred or has not. Women who are trying hard to have babies are very vigilant of signs of implantation. But these signs are not known to all.

In fact, sometimes some signs exhibited in the first pregnancy do not show in the next pregnancy. So these signs vary a lot and really intriguing which is why we have made a list of the common symptoms.

  • Implantation Bleeding
    1. Implantation bleeding (or implantation spotting) is one of the most typical signs of implantation. Bleeding occurs because of embedment of blastocyst into the uterus.
    2. It is due to breaking of blood vessels during the process of implantation.
    3. It is not heavy like menstrual periods it is rather light and pink to brownish discharge.
  • Implantation Cramping
    1. Implantation cramping feels a lot like menstrual cramping. This is why most women confuse both. They believe that it is the start of periods.
    2. This cramping is mild to moderate in nature. It affects lower abdomen and back and lasts for a few days.
    3. It is normal and it occurs due to contraction of the muscles of the uterus during contraction.
  • Swelling and tender breasts
    1. If your breasts have swelled up to the size of melons and it feels tender when touched, you can thank the sudden rise in your hormones for that.
    2. If your breasts feel swollen or tingly seven days after ovulation then chances of implantation to have occurred are high.
  • Basal Body Temperature
    1. Most doctors suggest women keep a chart of their basal body temperature.
    2. Hormone progesterone causes a rise in basal body temperature. It remains high during ovulation and implantation.
  • Frequent urge to urinate
    1. If you find yourself going to the loo frequently it indicates implantation. A pregnancy hormone called Human Chorionic Gonadotropin (HCG) increases the blood supply to the pelvic region.
    2. As a result of which the bladder becomes irritable making you visit the loo frequently.
  • Food cravings
    1. During and after implantation, a female’s body becomes an orchestra of hormones.
    2. So the female develops an aversion to certain food and develops sudden cravings for certain foods.
As stated above, the signs are not shown by all women and are not hundred percent indicative of pregnancy. So it is important to take a pregnancy test and be sure.


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