I drank a plan b pill the next day approximately 13hrs after. but ever since my stomach feels bloated and hard.the condom had broke what might it be?

Various possibilitie: wihtout directly talking to you and with an exam there are I cannot comment on your particular health situation BUT plan B often causes some GI disturbance directly and even more commonly causes menstrual irregularities due to its effects. Often triggers an early menstrual cycle. Progressive pain/hardness is a serious medical emergency though.

Likely progesterone.: If your symptoms do not get better in a few days, get a pregnancy test four weeks after your last period.