I need answers as I am desperate to know so if any one can help please answer this question :)

Im trying to work out if I could be pregnant or not. I last had my period from the 22nd April - 27th April, my partner and I had unprotected sex on the 27th - what are chances of pregnancy on the last day of my period?

My partner and I had sex twice very late at night on the 5th of May both times he finished inside of me and we finished at the same time (sorry its a little indepth) Just wondering what are the chances of pregnancy if we had sex that night? Taking into consideration that we are both still young healthy and fit adults :) My periods have always been quite regular and my cycle is about 31 days and I always have regualr periods :)

I find it difficult to work out my ovulation dates and most fertile days so please someone help me!