Can You Get Pregnant If Your Period Starts the Day After Intercourse?

Menstruation starts the day after the procedure?

Hello doctor, I have a question.
After having intercourse with my girlfriend, her period started the next day and lasted for 6 days.
Since the day her period started, I haven't had any sexual contact with her.
Is it possible for her to be pregnant? If her period has come, she shouldn't be, right?

Niming, 20~29 year old female. Ask Date: 2015/10/09

Dr. Lü Lizheng reply Obstetrics and Gynecology

If it is confirmed that menstruation has occurred, then pregnancy is not possible.
Sincerely, Dr.
Li-Cheng Lu, Taoyuan Hospital.

Reply Date: 2015/10/09

More Info

When it comes to the question of whether a woman can get pregnant if her period starts the day after intercourse, the answer is generally no. If a woman has her menstrual period, it indicates that she is not pregnant. The menstrual cycle is a complex process that involves the shedding of the uterine lining when an egg is not fertilized. Here’s a more detailed explanation of the menstrual cycle and the factors involved in conception.

The menstrual cycle typically lasts between 21 to 35 days, with an average of about 28 days. It is divided into several phases:
1. Menstrual Phase: This is when bleeding occurs, marking the start of the cycle. It usually lasts from 3 to 7 days.

2. Follicular Phase: After menstruation, the body prepares for ovulation. The pituitary gland releases follicle-stimulating hormone (FSH), which stimulates the ovaries to produce follicles. One of these follicles will mature into an egg.

3. Ovulation: This occurs around the midpoint of the cycle, typically 14 days before the next expected period. The mature egg is released from the ovary and is available for fertilization.

4. Luteal Phase: After ovulation, the body prepares for a potential pregnancy. If the egg is not fertilized, hormone levels drop, leading to the shedding of the uterine lining, which is the menstrual period.

In your case, since your girlfriend started her period the day after intercourse, it is highly unlikely that she could become pregnant from that encounter. The onset of menstruation indicates that no fertilization occurred during that cycle.
It's important to note that sperm can live inside a woman's body for up to five days, which means that if intercourse occurs just before ovulation, there is a chance of pregnancy. However, since your girlfriend's period started the day after intercourse, it suggests that ovulation had already occurred earlier in the cycle, and the egg was not fertilized.

Additionally, the presence of menstruation is a clear sign that the body is not in a state of pregnancy. If a woman has a regular menstrual cycle and experiences her period, it is a strong indicator that she is not pregnant.
In conclusion, if your girlfriend had her period starting the day after intercourse and did not have any sexual activity afterward, she is not pregnant. Menstruation serves as a natural indicator that the reproductive cycle is resetting, and pregnancy has not occurred. If there are any concerns about menstrual irregularities or potential pregnancy in the future, it is advisable to consult a healthcare provider for further evaluation and guidance.

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