HELP!

Okay, I’m on the pill. I have been for years. Never miss a period. My ex and I had sex on day 6 of my placebo pill. I still had some light bleeding with my period. I wore. Light days tampon the next day. Anyways, I haven’t had sex since then. I’m now 8 days late on my period. Remind you, I’m on the pill. So, no ovulation. I’ve taken 4 tests, all of them have said negative. I’m freaking out. Chances are low or basically nonexistent of pregnancy, right?