Period late

I experienced light pink  spotting today but it went away and never came back I just knew later on it would kick on but.... It didn't and I ended up having sex & I thought he would knock it on but noooooo.  On top of that My period is 3/4 days late if I don't get my period tomorrow I guess I will take a test that's the only way I'm gonna find out. I'm just trying wait it out but tomorrow would be officially one month since I had a period. 😔