late for a month to bleeding for a month to spotting

My boyfriend and I started having sex about 3 months ago using only condoms as birth control. The condoms never broke and I'm pretty sure precum have never gotten down there. He also pulls out before he actually cums. Since the first time we had sex (we've only done it a few times) I had been late for a month. I wasn't sure if it was pregnancy or due to stress about being pregnant. And then I started spotting and sure enough I started having my period. The period was light with little heavy bleeding here and there, and lasted for a month straight (kind of like when I first had my period). It then stopped and then started spotting again the next day, and now is a pink and brownish color and sort of thick at times. I'm not sure if this is a continuation of my period, but it is still going at the moment. We've had sex at least twice during my period and when i took two pregnancy tests, they were negative. I'm also not sure if its implantation bleeding because I've heard implantation bleeding only lasts a couple days, but this has lasted for over a week. Please help!