I had unprotected sex with pull out method but to be sure I took plan b after 4 hours. I had sex again 4 days later but this time with a condom. I got my periods earlier than expected that month(within one week after taking plan b.). The flow was usual but to stop the periods early I had ibuprofen 600mg every 4 hours as I was traveling on the 3rd day of my period. I was happy I got my periods. Now its been a month since that and I have not got my second period. Should I be worried of pregnancy? I don't have any symptoms of pregnancy like nausea etc. I didn't have sexual contact after that. Is this usual with plan b? I had a local type called escapel which is the same thing.