8 days late!

Hey ladies! So I had unprotected sex with my bf, however he didn't cum inside of me or on me for that matter. I'm worried about pre-cum tho. I was supposed to get my period on the 25 of feb but It didn't arrive. I am now 8 days late. I took 2 pregnancy tests and both were a solid negative. Does anyone know what's going on, or if you can help me stay calm... I'm really worrying about if I'm pregnant.