Such an over thinker

Okay, so feel free to call me dumb and such, I know.

My boyfriend and I had unprotected sex on Friday, Dec. 15, he pulled out before he came, finishing on my back.

My period started on Tuesday, Dec. 19. It was normal for me, very painful, very heavy, etc. It ended on the 23rd.

It is now Dec. 25 and I am experiencing “spotting” that I noticed last night after my boyfriend and I were playing with each other all night.

Could I be pregnant?? I’m 18 and terrified...