"i have taken this medicine several times now over the last few years. my husband and i have unprotected sex but he usually pulls out in time unless we&#039;re trying to get pregnant. every now and then he doesn&#039;t pull soon enough and i have to take the pill for safe measure. it truly works. some side effects i typically experience are: nausea, heavy or late periods, prolonged periods (up to 14 days long), sore/tender breasts, and cramps. i also get super moody and very impatient. although they aren&#039;t the most pleasant, it&#039;s worth it if you&#039;re not planning on have a baby. it works. this last time i took it a little after 48 hours of having sex, 3 days before i ovulated and we&#039;re in the clear :) good luck"