Is it okay to take both pills of postinor 2 at the same time immediately after sex?

Yes, but higher side: effects. There are other brands of the morning after pill that contain levonorgestrel and only have one double dose pill. There is a higher chance of nausea. With either way, your period may be off, but if it is over 7 days later than expected, it is advised that you take a pregnancy test. To be effective, take the first pill within 72 hours. Also, more effective early in menstrual cycle.