My bf and I had unprotected sex last night and he came in me. Well, we both freaked out and headed to Walgreens to purchase Plan B One Step. I took the pill about 35 minutes after the incident, and I went to sleep. However I am prescribed xanax for anxiety disorder, and I took one 2mg pill today as prescribed. But I am worried that it might affect the Plan B from working!?

If anyone can help me answer this, I would really appreciate it.
I NEED to continue taking the Xanax, however I DO NOT want to get pregnant. ... Help!