You might be hearing people talk about getting too many ultrasounds, as in multiple per week. That can be bad. Basically any time you get an ultrasound your tissue will heat very slightly due to the energy that is emitted on the fetus. That’s why it’s only recommended to have them done when medically deemed necessary
I found out AT 4 weeks and being so early they couldn’t see anything I’ve had 2 and it wasn’t bad at all! My last transvaginal when we finally got to see was 5w6d.
I don’t think it would be bad…that’s the only way you’ll get a good picture/heartbeat of baby this early is what I was told by my doctor.