"i was still nursing my 11 month old when my husband and i had unprotected sex (normally he pulls out, however this time, didn&#039;t). i checked my ovulation app to see what phase of my cycle i was in and it was close to ovulation, so i took plan b about 18 hours later. i had no side effects or adverse reactions. now 3 weeks later and i have taken two positive pregnancy tests. we obviously should have been more careful, as we weren&#039;t prepared to have another child so close in age to our first. please be aware that this is not 100% effective."