Can you get pregnant if you have sex while your on your period, and your partner ejaculate inside of you. When can you get pregnant besides ovulation?

Pregnancy. You can only conceive around ovulation, this is not around menses. Since sperm are viable for 3days and the egg can be fertilized for 24 hrs there is an overlap.
You can. I have seen this in my clinic. You can get pregnant at anytime, so use protection always......It's unusual, but it can happen. Optimally, after ovulation is the best time for fertilization to occur, but the sperm can hang around and depending on the time, can live long enough in the vagina to get to the egg.