Chances?

Went to see my SO (we live apart for job reasons right now) and ended up being on my period. We still had sex and didn't withdraw at all. My period was extremely light and short and the last day I was with him we had unprotected sex again and he went inside. That was almost two weeks ago and this past week I have been getting terrible heart burn I haven't hanged my diet and I never get it. Y sleeping schedule is all jacked too. I have other small "symptoms" but I don't want to read too much into it. Just want to know what the chances are I could be pregnant.