Advice please!

About 2 weeks ago I had a quickie with my boyfriend and we used a condom. I think it broke because I felt cum on me and it was on the bed. My boyfriend put water in the condom (he thought this was genius) to see if it had holes in it and but it seemed to be fine, so he was pretty satisfied that we were safe. I was a bit more skeptical but I opted not to get plan b. That was stupid. I started spotting like a week later and I was a bit concerned. My periods had been weird lately though so there were a number of reasons why that could’ve happened. My cycles have been pretty short lately (like 23ish weeks) but I’m on day 31 and I still haven’t gotten my period. Should I get a pregnancy test? I’m not sure If I should be worried right now because worrying about being pregnant could be the reason I’m late! I don’t even know if a test would be accurate because technically a cycle is usually closer to 30 days, mine have just been so shitty that being 31 days in is late. Any advice?