Plan B
"I'm 44 years old so not sure if it was the pill that indeed resulted in the negative pregancy test.  First, I ALWAYS practice safe sex and even go over board in making sure its put on properly, etc. So you can only imagine how surprised and devastated  I was when he withdrew and told me what happened. I immediately went in panic mode because I barely even knew this guy. He was very nice and very supportive through it all though. I took Plan B about 4 hours after the incident. It was 14 days from the first day of my last period so I most likely I was ovulating. I did have some side effects but none were listed on the box so may not have been from Plan B.  I had a stiff neck for 3 days and very vivid dreams on the 3rd and 4th day. That's it!"