I had unprotected sex on the 5th of march at around 4 in the morning after a drunk night out, i was due to start my period the next week, i went and got the morning after pill on the 7th early in the morning so i was within the 72 hour period to get it. I took the pill and then later that week got my period which lasted 5 days or so, that week i felt fine but the second week after taking it i feel nauseous all the time, is this because of the morning after pill and that hormones or am i pregnant?