I have had experience with the Morning After Pill before, but this time, I used a different brand (I used Plan B the first time, but this time, my friend gave me some that she got at Planned Parenthood. 4 pills now, 4 pills later; they were white.) I took them immediately when I got home, probably an hour after I had sex (it was protected, but I just want to be sure), which was 2:30 AM and went to bed. Woke up and ate, took the next dose. I still feel really sick to my stomach. Also, I was on the last day of my period. Will that mess up my next period?