Tachycardia

So I went for my anatomy scan and they said everything looked great except they couldn’t get views of the spine so I’ll have to return in 4 weeks for that however they said my heart rate has been running way too high anywhere from 100-160 when moving and working. They want to send me to a cardiologist and start me on a beta blocker but I heard beta blockers are not good for pregnancy that it can affect the baby’s respiration’s and heart rate! I need advice! Anyone got put on this and been ok and baby ok?