It's kind of odd for them to give you a heartrate reading that early on... most won't until late 6 weeks to 7 weeks along gestationally speaking.
That being said, both of my boys were 140 bpm or above when I was pregnant with them. I've come to find this myth, among others, is simply not true.
I would wait until between 16 and 18 weeks to find out. As long as baby isn't shy, that is. ☺️ I wish you a healthy pregnancy and safe delivery!