Had sex on the 16th of March 2014. Took postinor 2 the next morning as directed on its prescription. Had my withdrawal bleeding on the 21st of March. Had my last period on the 9th of March (irregular). Today is the 24th of April and no periods as of yet. No cramps or anything, just feeling very tired, this could be due to stress at work. I dont want to conceive. Am I pregnant?