I have a tilted uterus, ive been pregnant twice before (both miscarried at around 5-6 weeks, although one missed till 9 weeks). In my second pregnancy they saw the fetal pole at 5 1/2 weeks, however in this pregnancy (I am now nearly 17 weeks) we didnt see the baby till just past 8 weeks! And i was having weekly scans from 4 weeks because i had spotting. One week they said oh just a sac and your about 5 -6 weeks and the next week they saw the baby measuring 8 weeks 1 day and a good heartbeat.
The sonographer told me that it is not always textbook, sometimes they see things and sometimes they dont. Hang in there and i hope you get better news soon, I completely understand how hard it is, I was sure i was going to have another m/c but baby was there all along they just didnt see him/her.
xxxxxxx