Having intercourse more then once in a single day, what are my chances of getting pregnant?

Ok so me and Fiancé had intercourse on Valentine's Day. Being completely honest we did it four times in the same day and he did ejaculate every time inside me. Now what are my chances of getting pregnant? I wasn't ovulating but I was getting off my period at the time. Though after the intercourse I had a bit of blood but then the next day I had some brown stuff coming out of me. What are my chances of getting pregnant after all this?