t reccommend plan b because of my personal experience with it that led me to the er, I was allergic to its Main
hormone ingredient, levonorgestrel. But that's me. It should work up to 3-4 days after unprotected sex so 4 hours, yes you're good. You should never have sex until u are cleared by your ob first. At your 6wk check up. You may want to let your ob know about this & if you are breastfeeding, ask how plan b could affect your breastmilk.