Exercise restrictions first tri?

myshaybaby

Hi everyone-has anyone's RE given HR limits when exercising during the first tri? My doc has reiterated a hundred times to me that he doesn't want my HR going above 120, however one of the nurses at the office told me 140, and I can't find research anywhere to support either of those numbers. Before our IVF cycle, I ran, taught a weight lifting class for 8 years, and did boot camp and yoga, Insanity, you name it...working out 6-7 days a week.

The group fitness director at my gym noted that the HR limit of 120 is old and outdated and she specializes in prenatal fitness. It's not that I don't trust my RE, but I wonder if giving a flat HR max to all patients regardless of age, starting weight, and fitness level makes much sense at all. 

Input please, thanks ladies!