I have not had a period since the end of December 2010. Its not February 15th 2011 and I still have not had it. I am scared that I am infertile. I am only 25 and I have 5 year old daughter. I had an ultrasound done and I am not pregnant. Should I be worried?

Since you have had an ultrasound done I'm guessing u have been in contact with your dr. I had the same problem since the start of my period when I was 11 my issue was ovarian cysts I have 2 wonderful kids without any fertility treatments just because u miss a cycle doesn't make u infertile but even if its something else there r hormones that can help u out if u want more children