Longest period HELP

Okay so August 18th-19th I had had sex unprotected and it was a lot of sex like we did it 6 times but anyway the 20th I had started bleeding so I took it as my period because I was cramping my blood was kinda of dark brown I guess I just know it wasn’t really red anyway it feel like 2 weeks later my period has started up again but this time it’s super long and my period never last this long I’ve been on Bc since I was 16 I’ll be 20 in 4 months my blood is a continuous pace and it’s a bright red idk if it’s because I’ve been wonky with my birth control meaning I’ve been doubling up for the past couple of days because I forgot or before of something that had to do with sex can someone help