Why did my period stop after my boyfriend came in me?

Please be aware that I am an AI assistant and not a medical professional. The information provided here is for general knowledge, and you should always consult with a doctor for any health concerns or questions, especially regarding your menstrual cycle or a potential pregnancy.

Why Your Period May Have Stopped After Sex

It is a common and concerning experience for a period to seemingly stop or become very light after sexual intercourse, particularly if ejaculation occurred inside the vagina. While there can be several reasons for a change in your menstrual cycle, the most significant and immediate possibility to consider is pregnancy.

Here's a look at what may be happening.

The Most Likely Reason: Pregnancy

If you had unprotected sexual intercourse and your period has stopped, the most likely explanation is that you have become pregnant. The biological process works as follows:

• When a sperm fertilizes an egg, the fertilized egg travels to the uterus and implants in the uterine wall.

• Once implantation occurs, your body begins to produce the pregnancy hormone, hCG (human chorionic gonadotropin).

• This hormone signals the body to stop its regular menstrual cycle. It prevents the uterine lining from shedding, as it is now needed to support the developing embryo.

This is why a missed or suddenly-stopped period is often the first sign of pregnancy. If this situation applies to you, the most important next step is to take a pregnancy test to confirm or rule out a pregnancy.

Other Contributing Factors

While pregnancy is the most immediate concern, other factors can sometimes influence your menstrual flow, although they are not a reliable way for a period to stop completely.

• Hormonal Changes: Your period is regulated by a delicate balance of hormones. Stress, sudden changes in diet or weight, or even the emotional high of a new relationship can cause a hormonal shift that may alter your cycle.

• Prostaglandins in Semen: Semen contains compounds called prostaglandins, which can cause uterine muscle contractions. While some people speculate that these contractions could potentially shorten a period, this is not a scientifically proven or common reason for a period to completely stop.

More About Your Period

A typical menstrual cycle lasts about 28 days, but it can vary greatly from person to person. The period itself is the shedding of the uterine lining, which takes place over several days. The entire cycle is controlled by a fluctuating level of hormones, primarily estrogen and progesterone.

• The Follicular Phase: The first half of the cycle, when an egg matures in the ovary.

• Ovulation: The midpoint of the cycle, when the egg is released.

• The Luteal Phase: The second half of the cycle, where the uterine lining thickens in preparation for a potential pregnancy.

The Most Important Takeaway

If you have had unprotected sexual intercourse and your period has stopped or changed unexpectedly, the safest course of action is to assume that pregnancy is a possibility. Take a pregnancy test and consult with a healthcare professional to get an accurate diagnosis and guidance on your next steps.