"took plan b 14 hrs after unprotected sex &amp; the 3rd day of just starting birth control pill (suppose to use a backup method the 1st week). right after i took it i felt a little nauseous, but it wasn&#039;t unbearable. my period wasn&#039;t due for another 3 weeks (took birth control regularly leading up). kept getting abdomen pain &amp; i was very tired on random days throughout the 3 weeks. thankfully got my period the day i was expecting to! so thankful there is a pill for when mistakes are made!"