Freaking out!

T

I had unprotected sex 9 days ago and was supposed to start my period yesterday (Oct 21) and I still haven’t gotten my period. I didn’t take a plan b because I didn’t think it was possible to get pregnant a week before my period. I took two pregnancy test (one last night and then this morning) and they both came out negative. I know it might be too soon to tell but since I haven’t gotten my period could I be pregnant? 😰 I’ve been late on my period months ago but the last few months have been right on time. I’m trying not to freak out because I honestly don’t want to be pregnant. I know this was really irresponsible of me but I really didn’t think I could get pregnant before my period. Advice please!