Ugh! Weight loss

Before I got pregnant with my almost 2 year old I was 117lbs on a heavy day. When I had her is was 185 lbs. Yes, I know I gained a lot. It was the same with my first child (105 to 165). I worked hard and got down to 130lb before summer. Well, I have been stuck at 138 since July to the point I've given up on losing the rest. My original goal was to get down to 125lb (because well 30 year old is hard) but this last 10lbs is not going anywhere. When I give up and say forget it I float between 135 and 138. When I actively change my diet (teacher + farm + 2 kids = No time to workout) I gain weight. I went back to my no carbs and only veggies, beans, and lean meats life style and now I'm 142lb. What the actual fuck?!!!