Am I stressing out or?

Okay so we used protection, but the condom slipped off and we stopped. It like slipped outside but was kind of still in me. But it leaked outside , idk but I'm three days late and I'm nervous at this point. But my breast are super sensitive and painful and I've been in a bitchy mood. Is it my period coming soon or ? I just need insight I'll take a test soon. I have an irregular period btw, being 8 days late is like normal apparently .