Idk what to do help!!?

Ana Clara

So im 17 and for now I only have sex with protection. I had sex with this guy and i saw him put the condom on and take it of at the end. But my period should have started 4 days ago and im never late. Im regular and this never happened to me.... idk what to do, idk what to think. Am i just being paranoid or something?? Please help 😩