I had unprotected sex this morning, then took Plan B within 2 hours (~8 AM). However, he (and let's be honest, I) want to have unprotected sex again tomorrow. Thus, I will have taken Plan B about 30 hours before the possible second instance of unprotected sex.
Considering the ~72 hour limit for Plan B to be taken to protect against pregnancy, will I be protected in the second occurrence? If not, why not?