Hi, I gave birth on July 22, 11 had a unprotected sex 5 weeks later so I took plan B had a normal period on August 24, 11. It's Sept 28, and I have yet to have a period I took 2 pregnancy test yesterday and today and they came back negative I have had unprotected sex since the plan B can it be a possibility I'm preggo or is this the side affect of Plan B skipping the following month period and If preggo why isn't it being detected in urine yet. Thanks.