I had unprotected sex 2 days before I got my period with my ex and he came inside me, could I be pregnant?

I don't think so but it is possible. When you have your period it is because the egg wasn't fertilized. Some women bleed all throughout pregnancy. Nothing is impossible when you have unprotected sex. (I am not judging by all mean I am just saying when you have unprotected sex you are taking a chance of getting pregnant.)