hello and welcome to ehealth forum! if you are having normal periods (4-5 days) that you usually have then you can never become pregnant by having unprotected sex during your periods. however if you have a 26-28 day cycle or a shorter cycle of 24-26 days and have periods for 7-8 days then you need to be careful on the last 2 days. hope this helps. take care!
can i become pregnant after having intercourse during periods?