Should I be worrying???

So... Sunday the 19th on Father's Day I lost my virginity to a 20 year old that I thought loved me... Im 15 btw... My entinitons weren't to have sex but it just happened. Im not on any form of birth control and he didn't wear a condom... AND he came in me and it's my most fertile time of the month.. I think I fucked up..and now the guy I lost my virginty to won't even text me me... 😫im having mixed emotions right now..could I possibly be pregnant? Or should I not worry