You should not have unprotected sex after taking Plan B, or else you will run the risk of becoming pregnant. However, you can take Plan B and its generics AGAIN if you have unprotected sex. BUT plan B and its generics don’t work so well. So, if you find yourself using emergency contraception more than once a month, talk to your doctor about more long-term birth control such as the IUD, implant, ring, patch, pill.