Period super late

Hey guys!!

So I’m 16 and my period is 14 days late as of today. I’m a virgin, but the last sexual encounter I had was July 10th with my boyfriend and I gave him head and then afterwords he went to eat me out but I believe he was standing over my underwear while eating me out, I don’t remember. Afterwards, I put on my underwear and it was wet but I wasn’t sure if it was from me like 15-20ish minutes prior being turned on. I’ve also started school so I guess that could be stress. I know this is stupid but why two weeks late!