I had unprotected sex last night and i somehow missed taking my bc last night and took it this morning. do i need to take plan b?

Depends on details: A woman on birth control pills should follow the instructions of her doctor. So, her first thought should be, "What was I told to do if I missed 1 pill, or missed 2 pills?" Otherwise, the usual procedure after missing 1 "combination" BC pill is to take it as soon as remembered, which can mean taking 2 pills the next day. In that case, Plan B is not recommended, as the BC pills are still effective.