why did i get my period twice this month

I’ve always had ridiculously irregular periods. For instance, before my period this month, I hadn’t had one in 3 months. Starting then quitting birth control in November made it worse. However, I just got off my period less than 2 weeks ago and I got it again today. Doesn’t seem to be spotting, normal bright red blood. I’m so confused. I’m sexually active, but we use condoms. Help?????