Hi! I just had u/s yesterday and sac measured 6 weeks, but no fetal pole or heartbeat. Doc. said not to worry, but scheduled another u/s for next week. Says it just might be too early. Should I be concerned? No bleeding yet, but I'm really worried. Had previous m/c at 10 weeks. Anybody have similar situation and end up with a successful pregnancy? I'd like to hear from you. Thank you.