I had sex on February 15, that was the last day of my period. The condom had broke and I'm pretty sure I noticed as soon as it did. He hadnt came in me or anything, I took a plan b pill two hours after. The second 12 hours later. Then on the following Monday I started to have a really heavy flow, for about 4 days. I still haven't had my period, and I know stress can be a big factor, but I'd just like to see if I need to do anything about this or not.