I had sex and the morning after got plan b. now the day after i have an excess of clear discharge and cramps and have to pee a lot. is this normal?

Yes: Many of the symptoms you are describing are related to residual Prostaglandin effects found in seven. Nevertheless, if the urinary symptoms persist, evaluation to rule out a UTI (urinary tract infection) would be reasonable.

Yes: The symptoms come from the hormones in the pills for the plan b. This should improve befire your next menses and I hope all is well with you.