Hi! This has been worrying me half to death and I just thought I could use some guidance!

So, I am currently taking sronyx, the combined birth control pill.. and have been for going on 6 years now. Because of this, I have a VERY regular and scheduled period. However, for some reason this month I have gotten a second period, 2 weeks before my next period is due. This is very strange to me because I have not missed a dose and I take my pills on time every single day. Why could I be experiencing an early period while on the active pills? I’ve never had this happen so me so I’m not sure what it means.