I went today for my second appointment. My Dr told me that I should be about 11 weeks going by my last period, but my levels show me to be 4-6 weeks. A month ago I had a blood test and it had said about 4 weeks. He said I feel like I could be 14 weeks but it's possible that my uterus is just large because I already had one child. I have to wait until Monday for the ultrasound and it's driving me crazy! Any thoughts or ideas? Should I be worried about a miscarriage?

ps. He couldn't find the baby's hearbeat with the doppler.