We used protection and pull out method, my period is almost 17 days late

Hi Everyone,

So my boyfriend and I had sex on the August 26th, and we used a condom AND the pull out method. My last real period ended on August 12 I believe. I got my period really late (I was almost 17) and that was about a year and a half ago, but it has been fairly regular for the most part, so this is unusual. I only experienced some really light, brown spotting around when when my period was supposed to come in September, so I took a pregnancy test (EPT) which was negative. I kept worrying about it though, so about a week or two later, I took another prognancy test (ClearBlue) which didn't work. I waited several days and took the second one that came in the package and that one came back negative as well. Just yesterday (so only about two weeks after the last discharge stuff I think), I got fairly heavy dark brown discharge (and some blood I think), so I thought everything was back to normal now, but today, I have still had the dark brown discharge but it is very light. I am worried agian now. Around the time of the initial scare a couple of weeks ago, I also read somewhere that darkening aereolas are an early sign of pregnancy which I thought I noticed after I read that, but it might just be in my head. Could I be pregnant? What else could it be? What should my next steps be? Thank you so much, I just really am desperate for peace of mind.