You are you pregnant if had your period the day after boyfriend cumed in you?

It is very unlikely to get pregnant if you had your period the day after your boyfriend ejaculated in you. However, it is not impossible.

Sperm can live inside the female reproductive tract for up to 5 days, so it is possible that one of your boyfriend's sperm could have fertilized an egg that was released from your ovary during your period.

However, this is not very likely, as the cervix is usually closed during menstruation, which helps prevent sperm from entering the uterus. Additionally, the lining of the uterus is shed during menstruation, which makes it less hospitable for a fertilized egg to implant.

If you are concerned about the possibility of being pregnant, you can take a home pregnancy test. Home pregnancy tests are available at most drug stores and can detect pregnancy as early as 1 week after conception.