Worried about being pregnant

I’m 16 and me and my boyfriend had unprotected sex 2 days ago and he didn’t ejaculate but my period is a day late. Could I be pregnant? I’m on the pill but I don’t take it at the same time everyday. Am I just paranoid or could I be pregnant? Every time I feel like it’s started there’s nothing there and I’m just super scared. I just want some reassurance that I’m not cause I’m super worried. People also talk about precum but he doesn’t get it.

I had pretty heavy spotting about a week or so ago. Does that count as my recent period?

EDIT: I’m not pregnant I just took a test cause my period is a whole week late and the test came up negative!!! Not pregnant!!!