Friends, according to the calculation from the beginning of my period, I am 7+4 weeks pregnant. When I went at 5 weeks, my sac and yolk sac were seen. When I went to the doctor at 6 weeks, the doctor said that he heard the heartbeat but it was too small for me to hear. The next day I went to another doctor and he said the same thing. In fact, this doctor was so sure that he told me to come for a check-up in 1 month. Of course, I still couldn't hear it. Today I went to the doctor to hear it, but the doctor said there was a sac but no baby and that he would check from below. I didn't let him check immediately and went to a private doctor. He also couldn't see the baby and said that I was not 7 weeks but 5 weeks. Who should I believe? How can I be 5 weeks when I was 6 weeks last week? Has anything like this happened to you? Please help.