Plus Size before pregnancy & trying to lose weight..

Okay so I am 16 weeks pregnant with my first. I was 275 before getting pregnant and have been lucky so far not to gain any weight... so far. I want to lose weight before the baby gets here... not for vanity purposes but to be healthy for my baby. I want to start meal prepping and working out a few days a week after work... nothing crazy but just try to achieve a healthier lifestyle. Any moms trying to do the same or have done the same and have some good ideas and tips to help me get started?