Is this healthy

I just found out I am pregnant. Like, last night. I am overweight and have been trying to diet with shakes. Is it possible to continue this for the next few weeks?
Breakfast shake- almond milk, peanut butter powder, oatmeal, banana, ice
Lunch shake- spinach, banana, strawberries (or other fruit), yogurt, ice
Dinner- normal dinners, chicken, fish or meat with veggies and carbs.
I'm not cutting calories so much, each shake is 300-500 calories and trying to get the nutrients in. Just wanted to see