I thought you couln't hear it until after 10 weeks but should be able to see it at 7 weeks. Not sure if that is just because my doc just used the us machine in his rooms and it is not a good as one in the professional rooms where you have your 12 and 20 week scans.
apparently its not very good to hear the babys heartbeat in the first trimester as it 'upsets' them... its like the equivalent of a helicopter hovering over your house apparently. i heard my babies h/b at 17/18 weeks for the first time. the wait was agonising but well worth it. i first saw my sons h/b at 6wk4d though!
all the best to you and happy listening :-)
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