Can You Get Pregnant One Day After Your Period Ends? - Obstetrics and Gynecology

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Is it possible to get pregnant one day after menstruation?


My menstrual cycle usually starts around the middle of the month, with the following dates: July 19 to July 24, August 17 to August 24, September 15 to September 20, and September 21.
On the first day after my period ended, I had unprotected intercourse twice, with ejaculation inside.
For the remaining days of sexual activity, I used condoms correctly throughout.
My app indicates that my period should have started on October 15, but it has not yet arrived, and I only have a lot of discharge.
I would like to ask the doctor about the likelihood of pregnancy in this situation.

Baobao, 20~29 year old female. Ask Date: 2019/10/18

Dr. Huang Jianzhong reply Obstetrics and Gynecology


The menstrual cycle typically occurs around the middle of the month, with periods recorded from July 19 to July 24, August 17 to August 24, September 15 to September 20, and September 21.
On the first day after the last period, unprotected intercourse occurred twice, with ejaculation inside.
The remaining days of sexual activity involved the consistent and correct use of condoms.
Currently, the app indicates that menstruation should have started on October 15, but it has not yet occurred, and there is only a significant amount of discharge.
I would like to ask the doctor about the likelihood of pregnancy in this situation.
Answer: The likelihood of pregnancy is low.

Reply Date: 2019/10/18

More Info


Yes, it is possible to get pregnant one day after your period ends, although the likelihood varies based on several factors, including the length of your menstrual cycle, the timing of ovulation, and the lifespan of sperm.

To understand this better, let's break down the menstrual cycle. A typical menstrual cycle lasts about 28 days, but it can range from 21 to 35 days in adults. Ovulation, which is when an egg is released from the ovary, usually occurs around 14 days before the start of your next period. For someone with a 28-day cycle, ovulation would typically happen around day 14. However, if your cycle is longer or shorter, the timing of ovulation can shift accordingly.

Sperm can live inside a woman's reproductive tract for up to five days, which means that if you have unprotected intercourse just after your period ends, and you ovulate shortly thereafter, there is a possibility of becoming pregnant. For example, if your period ends on day 5 of your cycle and you have unprotected sex on day 6, and you ovulate on day 10, the sperm could still be viable when the egg is released.

In your case, you mentioned that your menstrual cycles are typically mid-month, and you had unprotected intercourse on the first day after your period ended. If your cycle is around 28 days, ovulation could occur approximately 14 days after the start of your last period. If you have a shorter cycle, say 21 days, ovulation could occur as early as day 7. Therefore, having unprotected sex on the first day after your period could potentially lead to pregnancy if you ovulate soon after.

Regarding your current situation, where your period was expected on October 15 but has not yet arrived, it is important to consider that various factors could affect your menstrual cycle, including stress, hormonal changes, and health conditions. The presence of discharge without menstruation could be a sign of pregnancy, but it could also be due to other factors such as hormonal fluctuations or premenstrual symptoms.

To determine if you are pregnant, the most reliable method is to take a home pregnancy test. These tests are designed to detect the hormone hCG (human chorionic gonadotropin), which is produced shortly after a fertilized egg attaches to the uterine lining. If you take a test and it shows a positive result, it is advisable to follow up with a healthcare provider for further evaluation and prenatal care.

In summary, while it is possible to conceive shortly after your period ends, the likelihood depends on your individual cycle and timing of ovulation. If you are concerned about the possibility of pregnancy, taking a home pregnancy test would be a prudent next step. If you have further questions or concerns, consulting with a healthcare provider can provide personalized guidance based on your specific circumstances.

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