Late period but negative tests

Brittany

I’m on the pill, but i’m not 100% perfect at taking it. I know i missed just a couple of days last month but always doubled up after. Now i stopped my pack on Feb 8th (Friday) and expected my period on Sunday (8 days ago). Still no sign of AF. All negative pregnancy tests. Does the pill just make you miss a period? I’ve been on it for 3-4 years and haven’t missed a period. Any other possibility?