PLEASE HELP

Maria

So around May 26, my boyfriend and I had sex and were using the pull out method. He pulled out just before, but unfortunately some got on the outside of my vagina. About 5 hours later I got my period, but about 2 hours after that we decided to take the plan b just in case. It didn’t affect the period I was already on, but now on July 3 I’m already about a week late. Should I take a test or is it just the pill messing with my cycle?