Why is this? Periods?

it could be it was old blood. I was on the patch twice in my past and both times they made me sick as hell I had the brown discharge stuff also,I personally think that most birth control is bad for your body like I’ve been on the patch,the pill and the shot and the shot was the worse caused me to bleed for almost 2 years non stop. maybe your body isnt very immune to birth control? I don’t know really but there are other things you can try but for now I would advise you too let your dr.’s know about it and maybe they can help you figure out whuts the best choice for u. there is also the iud,nuvaring,condoms lol and you wanna keep track of your menstrual cycle because you never know if your just having irregular periods that may be 2 whuts going on. like about 2-3 years ago I had dysfunctional uterine bleeding that would not stop,and now I am having overly heavy cycles and am probably gunna need a hysterectomy. but good luck.