Dear Practo User, Don't worry that much , the symptoms you are describing can be adverse effects of the Plan B pill. The possibilities of your being  pregnant are very rare as you took the pill within the time period needed for it's action. There's nothing much you can do now apart from waiting for your menses which can come early because of the pill

less likely that u r pregnant. looks like side effects of emergency contraceptive. wait for ur next periods, if u pass a week after ur due date, do UPT. now just wait and watch.. avoid frequent use of I pILLS