Ummmm

Hi y’all! So I’ve been on sprintec (just the plain old sprintec, not the tri kind) for about 6 months now. I thought my periods were getting less painful and lighter like they’re supposed to on birth control, but this month has been a different story..I started my period on 9/27 and it is STILL going almost a week later. My periods are usually exactly 5 days long, and I’m just a bit confused. This has also been the most painful period I’ve had since starting birth control. I just wanted to get your thoughts? Why would it have been like this? Any ideas?