Period longer than usual

So more than a week ago I got my period (I was very relieved because i had sex a few weeks before that and I thought i was pregnant) and it was very light and i'm not usually light on the first few days. And then on day 4, it was so light, I barely thought i even had my period. I ended up going out with my cousin and ended up having sex with one of my cousins friends. The next 3 days I didn't bleed at all and I had sex again with the same guy but only after that again did i start bleeding again and i've been going on 11 days now. I need advice. Sorry if it sounds like i have a lot of sex, I really don't, was just a coincidence that these events happened so close to each other.