Chances are that you will be okay. Expect to have changes in your cycle. It is important to use a condom until your cycle becomes regular and normal again.
There have been cases where Plan B is NOT effective at all for overweight women.
I'm on loryna I missed one pill. I never took it the next day, but continued with the pills. 5 days later I had sex, and we didn't have a condom. About 21 hours later I took Plan B one step. taking plan B. What are the chances of getting pregnant?