There are possibility that you may be pregnant when sperms enter while in period?

While it is possible to become pregnant during your period, it is highly unlikely. The most fertile time of a woman's menstrual cycle is the days leading up to ovulation, known as the fertile window. Typically, ovulation occurs around 14 days before your next period begins. During the period, the uterus sheds its lining and the cervix is dilated to allow menstrual flow to exit the body. While sperm can survive in the female reproductive tract for up to 5 days, it is not likely that they will be able to fertilize an egg during menstruation due to the hormonal changes and the conditions in the uterus.

Here's why it's unlikely to get pregnant during your period:

1. Reduced Estrogen Levels: During menstruation, estrogen levels are low, which affects the receptivity and thickness of the uterine lining. This makes implantation of a fertilized egg less likely.

2. Progesterone Levels: Progesterone levels are also low during your period, which means the uterine environment may not be optimal for the survival of a fertilized egg.

3. Increased Cervical Mucus: Menstrual flow consists of shed uterine lining, blood, and cervical mucus. This thickened mucus can act as a barrier to sperm, making it more challenging for them to reach the fallopian tubes.

4. Open Uterine Cavity: During menstruation, the cervix and uterine cavity are dilated to expel the menstrual flow. This may disrupt the ideal environment for sperm to travel through and successfully fertilize an egg.

5. Hormonal Imbalance: Menstruation is a time of hormonal change. The decrease in estrogen and progesterone, along with the release of other hormones like prostaglandins, creates a hormonal imbalance that can affect the optimal conditions for conception.

It's important to note that while the chances of getting pregnant during menstruation are lower, they are not zero. If you are concerned about unplanned pregnancy, it's always best to use reliable methods of birth control, regardless of where you are in your menstrual cycle.