Discharge!??

Tmi- anyways I had my period the 19th to the 24th of august, then got it again from the 1st to the 3rd of September!? I have missed the last two days of my birth control and I have missed probably 8 more in the last two months. I don't know if that's a reason why? I'm very confused because now since yesterday I've been having brown discharge and I don't know what to do or think? Any answers would be great.