Heartbeats!!

UPDATE: had a follow up today (one week later) and both babies are measuring perfectly and are on great track! ❤️ baby a at ~145bpm and baby b at ~135bpm.

So baby a measured at 6w2d at 149bpm and baby b at 6w1d at 103bpm. They said baby b’s heart rate is slightly lower than they’d like to see, but when I do some google/reddit search, it seems like normal? They said baby a had a great heartbeat though. What do you guys think? I do have a follow up later in the week!

The ultrasound tech said when it’s so early the measurements are harder to get accurate. Also my doctor told me it could all just be because the hearts just started beating but want to check back in at 7 weeks.

Background: 6 days prior, baby a’s gestational sac measured at 5w5d with just a yolk sacs, baby b’s gestational sac measured at 5w2d with no yolk sac.

Im definitely worried about vanishing twin because I know it’s common, but also read that the chances decrease a lot after heartbeats are detected.

Wanted to hear stories and stuff from you guys!