"took this about 10 hours after unprotected sex. felt fine the day i took it, but about 3 weeks later i started to feel sick to my stomach, crampy and had lower back pain. of course i panicked read lots of negative reviews and took a test, which came back negative, but i also took it about 2 1/2 weeks after intercourse, so it was still early. fast forward 2 weeks and my period is here. for me it did what i needed it to, so i was okay with the side effects. do not overthink it and don&#039;t read all the negative reviews, it does work!"