Orange theory and HIIT for a non fit woman

Hi all!

I have done orange theory on and off for years. A few sessions a week is typically what I would attend to keep myself active and not bored from the normal gym. Some weeks I wouldn’t go at all some weeks I would. I am definitely not “fit” by any means and kind of fell off the gym wagon and had started getting back into it when I got pregnant. Now I am almost 8 weeks and have read mixed things about working out. When I read I would see things like keeping your heart rate down around 140-150. For me, that doesn’t feel like a tough workout just lightly active. The NP at my OBs office said not to follow that and workout. What have you all been advised?

Thanks so much!