I am 7 weeks plus a few days and I just went to my first dr. appt today. I have my exam next week but I was talking to the nurse today about trying to figure out exactly how far along I am b/c I am thinking my last period may have been implantation bleeding. Anyway-The nurse pretty much told me that I should be able to hear the baby's heartbeat by next week (8 weeks) and they don't do any ultrasound/sono until 20 weeks!!!! She told me they can't really tell me how far along I am until this point. I think this sound excessive. Can you insist on an ultrasound? If I can't hear the heartbeat, am I just at the mercy of the dr., waiting for my monthly exam to check the heartbeat again?