I’ve only taken the morning after pill once and it was because my partner at the time was an idiot and “forgot” to pull out.
Before then I’d only ever used condoms and never had sex without them, but this was the one time unfortunately. I’ve always been wary about taking meds in the first place, and I’ve heard many stories about possible side effects, but my experience was rather decent. I got like one small cramp and that’s it. No nausea or feeling ill.