pregnancy weight

Prior to me getting pregnant, i gained 30 pounds within a year binge eating my way through depression. I was trying to lose weight before i got pregnant because i was at a healthy 150lbs at the beginning of the year. I am now ending the year at 183lbs. Im super scared of gaining weight during my pregnancy and was wondering if anyone SAFELY lost some poundage during their first trimester? How did you do it? 
I want to lose weight because i know i will be gaining baby weight. I know it sounds silly to lose weight just to gain it back but it is for mental health purposes, and this is important to me.
Thank you!