Late period on Birth control

So, I started Mylan Birth Control 3 months ago (this is my third month in it) my boyfriend and i are sexually active. We don’t use condoms but we are both tested and clean. I take it everyday at the exact same time. My last period was January 15-19 and I started my new pack right on time. On January 23rd I got a cold flu and started taking musinex. We were intimate 2 times this month, Once on the 21st and again on the 29th. I’m now on my 5th day of Sugar pills and haven’t started my period. I have very little cramping, major appetite and i’m tired (which i usually am while pmsing) I just need some peace of mind