Keto while pregnant?

I may be posting this in the wrong group so if I am please delete it but I’m wondering if I can start keto while pregnant? Currently almost 8 weeks with baby #3 and I am terrified of gaining the weight like I did with my first two (50 some pounds with my first, and then 70 some with my second.) I’m a lot more active this pregnancy as my job is extremely physical but I’m being promoted in a few weeks to a much less physical job so I intend on starting back at the gym but I don’t think it will be enough to keep off the extra weight. So would it be okay to start easing into keto now to keep the weight off? Or should I just avoid it altogether for the time being? Any input is greatly appreciated!