I haven't had an u/s with this pregnancy yet, but with DS I had one around 6w and again a week later. The earlier u/s had his hr at 103, and at the second I think it was up over 160. They sent me back for a second u/s a week later because the hr was too low the first time. Just turned out that I was a little earlier in the pregnancy than they thought based on LMP (which I already knew).
They are just looking for something over 120 at 6w for a healthy baby. Other than that, the hr can vary greatly as you can see by the posts here.
Re: 7 Weeks Heartbeat
7 weeks = 133bpm
9 weeks = 182 bpm
7w0d was at 113. Sonographer said it was "ok" and they're having me come back in at 8w3d to check it again.
DX: 6/9/2011: Azoo ICSI/IVF only option for biological child
IVF #1: ER - 9/26 * ET - 10/1 * beta#1 10/13 - 140 * beta#2 10/17 - 477 * beta#3 10/20 - 1101
1st u/s at 6w6d - one hb * 2nd u/s at 8w3d - no hb detected 11/10/11 * natural m/c 11/13/11
FET #1 Jan/Feb 2012 - 3 delays - cancelled 2/13
FET #1.2 - May/June 2012 - ET 6/6/* beta#1 6/15 - 95 * beta #2 6/19 - 322 * beta #3 6/22 - 940
7/6 1st u/s @ 7 weeks - one beautiful hb - released from RE
EDD 2/22/2013
PAIF/SAIF/PGAL welcome
I haven't had an u/s with this pregnancy yet, but with DS I had one around 6w and again a week later. The earlier u/s had his hr at 103, and at the second I think it was up over 160. They sent me back for a second u/s a week later because the hr was too low the first time. Just turned out that I was a little earlier in the pregnancy than they thought based on LMP (which I already knew).
They are just looking for something over 120 at 6w for a healthy baby. Other than that, the hr can vary greatly as you can see by the posts here.