The newer Morning After Pill (Plan B and an other brand name) are only progesterone, so they are less likely to make one ill.
I had to take it. We had a problem, he thought he was in one orifice and he was in an other. (If my ass "tighter" than the front door, as he says, how did he not notice the difference?) I freaked out when I realized he ejaculated, with no birth control in place.
The next morning I shakily called around to make sure our local pharmacy had it, they did. It was a few years ago, so it was two pills, where now it's only one. I took the pills the way the instructions said. I didn't get sick at all and I get nauseous from everything, I felt OK. I got my period right when I was supposed to.
We have 3 kids, My Man I and I don't want more kids. My Man is in his 50s and life and money is rough enough. My health sucks, and a pregnancy would have been awful, and now seeing the economy in the toilet, I'm glad I didn't get pregnant. I don't even think I was ovulating at the time I took it, but I'm glad I did.
What the drug does is to prevent ovulation and make the uterus "hostile" to implantation. You aren't "pregnant" until a fertilized egg implants, so it is NOT an "abortion" pill. It works the same way the mini pill does, and the same way pre-menstrual breastfeeding does.
I also bought a dose for my oldest daughter when she came in to me crying, when her boyfriend's condom broke. One trip to the pharmacy, and she didn't have to worry about becoming a mother before she was ready.
Neither my daughter nor I had any lingering effects from it, and long term side effects are not common.
I'm glad we have the freedom to use this if we need to.