Labetalol ? Help ...

So lately my resting heart rate has been between 120-130 doing no activity . Blood pressure is always normal. Passed my glucose test . No anxiety or stress. My OBGYN is putting me on Labetalol and I don't want to take anything unnecessary that could harm the baby but I know not taking it could harm myself and put my baby in danger so I will take it .. Anyone have any insight about this medicine ? Safe ? Experiences with this ? Unnecessary ? Any opinions are appreciated .. 
Reason I'm so nervous about taking this .. my OBGYN is very busy and brushes everything off with medicine to get you the hell out of his office as quickly as possible ..