Started Birthcontrol and period is so heavy!

Katelyn
So I started my Birthcontrol last Monday (Sept 12) and my period wasn't due until Sept 14 but my doctor suggested I took it right away.
So 2 days into the pill I got my period exactly on Sept 14, and I've been bleeding sooo very heavily and its been 5 days now. (My period hasn't ever been this long or this heavy) this should be normal right? How long would/should this last for?