Plan b

So I recently had a little too much fun with my boyfriend on a tipsy night and it led to an uh oh that required a plan b, it’s my first time taking one and I just wanted to ask if it’s normal to still be on my period after 14days it’s been a whole lot of back and forth as well with some days being really bad cramps and heavy bleeding to little to no blood for a whole day and then back again, should I go to the doctors or continue to ride it out?

I should also say my period was supposed to hit a week after I took the plan b so is it possible I’m dealing with the flushing of my system from the plan b stacked with my normal period?