I am 9.5 weeks along and just got my rented Dr's-office-quality doppler from bellybeats.com on Tuesday...I tried it twice on Tuesday and didn't hear anything, then once on Wednesday for just a few minutes and heard the heartbeat! My husband didn't get to hear it so I would love to try again, but how often is it safe to use? My stomach does feel a little different right after I've used it and I don't want to do any harm. How often did you use yours? Thanks! Thanks for the responses! I'm definitely not sending it back, I will probably keep it for 2 months...it is the best $36 I ever spent! Sure when I couldn't find the heartbeat at first I was a tad worried although I did figure it was too early, but thats nothing compared to simply not knowing for 5 weeks between ultrasounds. Hearing my baby's heartbeat has brought me relief beyond description and every time I remember what it sounded like I can't stop smiling! Also, I am even more relieved because they say the odds of miscarriage after hearing the heartbeat past 9 weeks is greatly decreased - something like 4% if you haven't had any spotting. So I am on cloud 9 and thrilled that I rented it. I do understand your concern though - if you don't hear the heartbeat one day don't get discouraged because the baby is so small at this point with a lot of room to "hide".