Is this even possible? Could i be pregnant or is it all in my head?

Hi, i Was hoping someone could help me as I feel like this is difficult to tell whether it’s in my head or not. I had unprotected sex 1 day before my ovulation window (5 days before ovulation). I wasnt planning a Pregnancy so this is why I’ve been going a little bit crazy hahah (if pregnant it won’t be a bad thing) and ever since I have had really sore boobs and reslly tired. This is completely un usual for me because I don’t really get sore boobs even at my period. I’ve sort of felt I’m about to get my period, a little bit crampy. I’m only 2dpo. I know this is extremely early but I’ve read women have had similar experiences and turned out pregnant in a few weeks. This this possible or is it all in my head?