Around 6 or 7 weeks, my lil guys heartrate was at 175 and now at 34 weeks, he is consistent between 138 and 150
A baseline for a babies heartbeat is 110 to 160 and they like to see it above 120. Usually at 6 weeks, or early pregnancy, baby has one of their highest heart rates
You're still very early on and the heart may only just be starting up. Ideally they like it to be over 100. Are they going to do a repeat scan soon?