plan b

I just got out of a very very long term relationship with my ex about a month or so ago...he left me for another girl. It's been rough. I was never on birth control while with him because we were trying to conceive and have a baby for a very long time. Tonight I hooked up with someone else kind of randomly. He used a condom, but I went and bought the plan B pill just to be extra safe. It was a good time and we may even do it again within the next few days (and continue to use condoms) I plan on getting back on birth control now that I'm single but until then within the next few days, if I've already taken the plan b pill and am using condoms, should I still be okay if I have sex again within the next few days? I guess I just don't know exactly how the plan b pill works...anyone with any knowledge please let me know! Thank you! And please, please, please keep any negative or rude comments/opinions to yourself..