I had unprotected sex while on my period. to be exact it was right after it started and it has now stopped. what could this mean?

Period and sex: Having sex on the first day of your period, assuring it was your first day would not normally cause your period to stop but would also NOT put you at risk of pregnancy, See GYN if the period stays irregular. Good luck.

Almost no chance.: The key factor is the length of your cycle. Women with a shorter menstrual cycle (time between periods) have a very slim chance of conceiving if they had unprotected sex on the last day of the woman’s period and almost no chance if they had unprotected intercourse during the first day of their periods. Women with a common cycle (for example 28 days), have almost no chance in either scenarios.