Delayed Period: Possible Causes & What to Expect

Question
I am 20 soon to be 21, and i have a 15month old daughter. The first day of my last period was feb. 08 2006, I am 15 days late on my period, but i went to the er and they said i was not pregnant.  i dont have a yeast infection, and my urine sample was fine.  They said they were going to do a internal ultrasound, but they did not do it,  they said they were going to do blood work and they did not...what could be wrong?

Answer
If your last  period started on February 8, and you have a normal cycle, you were due for your next period on March March 7. You are around  14 days late. If the pregnancy test showed a negative result,  then you probably have some hormonal imbalance this month. Just keep a record of any bleeding you have for the next three months so we  can see how long your cycle is. As long as you re not pregnant, there is no danger. Just keep a record of your bleeding.