Do you believe in signs?

So this is super weird but I had unprotected sex last night using the pull out method, and I DO NOT want to get pregnant. Haha yeah I'm an idiot. Didn't think too much about it but today I have seen multiple ads online for the plan b pill, which I never see. I'm not religious but i kind of feel like I should go get it now...
Anyway do you ever take things like that as signs from the universe/higher power?