How was your baby’s heart rate at 6w3d?

So I had a private scan done today my LMP is 11/26/21 but I didn’t ovulate until 12-18 so all calculators say I am 7w3d but I’m measuring 6w3d which makes since since I ovulated a week late. Heartbeat was 115 is that good? Isn’t that a little low? You could hardly see anything because I have a retroverted uterus and baby was right up on so edge but you could see a heart flicker. This is baby number two. I’m curious cause with my son I was 6w5d first ultrasound and his heartbeat was already at 155

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