Bleeding badly 😢😫

I'm really scared ... So I had my period may 18th and it ended on the 22nd or 23rd it was a normal period like always, nothing unusual... It's now June 1st and my next period is not supposed to come for another 2 weeks I started bleeding early this morning and I noticed a little blood in my panties later on I called the doctors and explained and they asked me about my birth control I'm on the the patch which they looked up and shows no side effects of bleeding .. Anywho it bleeding now a lot heavier and I have mild pelvic pain I'm really worried because this has never happened. Me and my boyfriend are very sexually active and yesterday we had sex a lot it wasn't anything different from when we ways have sex but I'm just scared and worried this has never happened to me before... Has anyone experienced this ? Any ideas ? I have a doctors appointment tomorrow I'm just anxious and worried. Any advice or comments would help. 
Thanks 😣Â