No it is not ok and can make you very sick and is no way to start off a pregnancy.
Not only that, I actually think it can backfire for a sway because your body perceives that there is a crisis, assumes you are in a fight for survival, and will make testosterone out of every bit of food you take in and also your stored body fat. So you may inadvertently end up swaying BLUE at least in the short term, till you get the weight off.

