advice please! red sea

so, to make a long story short, started birth control on the 9th so i already knew my period would be like 3 weeks late (it’s the patch). had sex on the 16 (which i haven’t had in a long time and he was definitely not in the small category), started bleeding on the 17th, the bleeding slowed down so on the 18th, then the bleeding started but wayyyyy more. to this day im still bleeding, having sharp pains and cramps, and the bleeding is way more intense then my period. i am filling up tampons 3 times a day. already have a doctors appointment, i just wanted advice and/or to see if anyone else has went through this.