I have been on birth control for the last couple years. But i recently missed 3 pills so i started my period a week after i just got off it. The day i got off that period i had unprotected sex. I took plan B maybe 5 hours later on august 18th. I wasnt sure when i would have been ovulating because of how messed up i made my cycle. I had no symptoms until about 2 days ago sep. 14th when i started feeling nauseous. It is now the 16th and i still feel nauseous but no vomiting. I was supposed to start my period on the 11th and im getting worried. But the real problem is that im still having sex. So i need to take my birth control. So should i take it now or wait until my period starts? if it does...