High heart rate? Help?

I'm 32 + 2 and have had a high heart rate the last 2 times I was there it was 150/98 then it went up after they came back and checked me. (I wasn't walking around, I wasn't nervous, I ate a good breakfast and I'm not dehydrated.)

What happens if that continues? They want me to get an EKG done I haven't yet but I've had tachycardia previously in a different pregnancy and I ended up being induced at 37 weeks but I've been fine all pregnancy until now.

What happens if I continue to have a high heart rate? And there's nothing medically wrong as in me having tachycardia and it not being my thyroid I'm asking the people that have had this happen only because I want to know what to possibly expect tysm in advance