I am 19years old and I am 3 weeks late for my period. When I was about a week late I took a few home pregnancy tests and they all came back negative. I went to the doctor and she did a blood test on me when I was still about a week late and it said negative too. It is now 2 weeks later and still no period. I have taken another home pregnacy test and still shows no. I called my doctor and she wants me to come in for an ultrasound but there is only one problem, I have no insurance. My boyfriend and I do not want a baby but I have been off of the pill since October becuase I wasn't taking it regularly anyway. We have been careful even though we have been having unprotected sex, but I am so confused! I just want to know one way or the other. I have always had regular periods so this is a big shock also I feel tired all the time! What does this mean? Should I go ahead and pay for the ultrasound and will it even tell me for sure? Someone please help!