Bleeding

Hi ! So , I’m on birth control , more for the reason to regulate my period because I’ve had them unregular since I got it until I started birth control . I had a hiccup where I didn’t take it for a day then took 2 the next. A week or so after that I got my period, it started off as a drop of blood and increased more by the day , then for about 4 days it was just brown discharge looking blood? Then it stopped for a day or two. But mind you; that bleeding wasn’t on the week I was supposed to get my period by birth control . The period row of my birth control finally arrives, about 2 days later and I get my period as well. So that’d mean I bled for a week , and now I’m starting to bleed yet again for another week because of my period … but I thought the first time bleeding WAS my period but just regulating again because of my birth control hiccup. So two period in the span of two weeks, what’s going on!???? Is this normal ? Is it so called “breakthrough bleeding” or should I be worried? Im sexually active, but no risk of STI so it’s not that . Helppp