Period question

Hi ladies! I got off depo in May. My bleeding has been super irregular until really early July. Me and my fiance are sexually active pretty regularly. Last week, after 3 weeks of no bleeding I got what I think was possibly my period. It only lasted one day but it was super heavy and painful to the point I got nauseous and sick. I took a test a week and a half before the bleeding started because I noticed I was late. It was negative. I bled through everything and all over our bed. Could it have been a possible miscarriage or just my hormones? TIA!