Can You Get Pregnant After Unprotected Sex on Your Last Period Day?

Pregnancy matters?

Today is the last day of my menstrual period, and I have been taking birth control pills.
Tonight, I am scheduled to start taking the pills again after a 7-day break.
However, this morning, I had unprotected intercourse with my boyfriend, and he ejaculated inside me.
Is there a chance I could get pregnant?

Xiao Fengqing, 20~29 year old female. Ask Date: 2015/08/20

Dr. Lü Lizheng reply Obstetrics and Gynecology

1.
The menstrual period has just ended, and typically, the egg is not yet mature, indicating that it is not the ovulation period, so the likelihood of pregnancy is low.

2.
Menstruation signifies the shedding of the endometrial lining.
Since the menstrual period has just concluded, it indicates that a new lining is still developing and is not yet thick or mature enough.
Even if ovulation occurs, implantation of the embryo is unlikely, thus the chances of pregnancy remain low.

Respectfully, Dr.
Li-Cheng Lu, Taoyuan Hospital.

Reply Date: 2015/08/20

More Info

When it comes to the possibility of getting pregnant after unprotected sex on the last day of your period, there are several factors to consider. First, let's clarify the menstrual cycle and ovulation.

The average menstrual cycle lasts about 28 days, but it can vary from person to person, typically ranging from 21 to 35 days. Ovulation usually occurs around 14 days before the start of your next period. Sperm can live inside the female reproductive tract for up to five days, which means that if you have unprotected sex close to your ovulation period, there is a chance of becoming pregnant.

In your case, since you mentioned that today is the last day of your period, it is generally considered to be a low-risk time for pregnancy. However, if your cycle is shorter than average, or if you ovulate earlier than the typical cycle, there is still a possibility of becoming pregnant.
You also mentioned that you are taking birth control pills. Birth control pills are designed to prevent ovulation, and when taken correctly, they are highly effective at preventing pregnancy. However, if you have just finished a pack and are about to start a new one, there is a small window of time where the effectiveness may be reduced, especially if you missed any pills or did not take them consistently.

Since you had unprotected sex and your boyfriend ejaculated inside you, there is a potential risk of pregnancy, albeit it may be lower due to the timing in relation to your menstrual cycle. If you are concerned about the possibility of pregnancy, you can take a home pregnancy test about two weeks after the unprotected intercourse for the most accurate result.
If you are worried about the effectiveness of your birth control or if you have missed any pills, it might be wise to consult with your healthcare provider. They can provide guidance on what to do next, including whether you should consider emergency contraception if you are within the appropriate time frame.

In summary, while the likelihood of getting pregnant on the last day of your period is generally low, it is not impossible, especially if your cycle is irregular or if you ovulate early. The use of birth control pills significantly reduces the risk of pregnancy, but it is essential to take them consistently and correctly. If you have any doubts or concerns, it’s always best to consult with a healthcare professional for personalized advice.

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