Has anyone been prescribed Metroprolol during pregnancy

Am
I am 22 weeks pregnant and have been prescribed metroprolol for SVT. 
My heart rate will go as high as  190bpm at times and stay there.
Just wondering how anyone else handled it? 
Should I talk to my cardiologist? 
Should I just trust my OB? The one who has prescribed it? 
I'm nervous lol. 

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