My period is 5 days late. Help

Hey guys so I have protected sex with my boyfriend quite often, he always pulls out with a condom with spermicide in it. Usually he doesn't cum in me. We had sex about two weeks ago and I think he came in me for a few seconds before pulling out. My period is 5 days late now and it's always on time. I just started a new antibiotic and am not on the pill. I just recently started smoking weed. Would that contribute to a late period??

I've also been more active this past week.

Please help. I'm nervous