Open Question: Two periods? IM THINKING ITS STRESS.?

I had sex on july 16th, and we were protected with a condom and he pulled out. I had a some bleeding when my period was suppose to arive but it was like a week early, it started Aug 3rd and should start on the 6th or so. This lasted for five days and was super light. Well yeasterday I started a pretty heavy flow and i have major cramps. What does this mean. I also had surgery on my nose on the