I hear ya, I'm 12 weeks pregnant and just lost 120 lbs total last year! I'm afraid of gaining too much, and I'm also afraid of not being able to work out or be healthy after the baby comes. But I am going to stick to eating healthy. I think as long as we watch what we eat we should be ok! Just be strong. And worst case scenario, if we do gain, if we've lost once, we can lose again! Best of luck to you! Something I did was I calculated how many calories I need per day to maintain my weight with little to no exercise. I'm having a few complications, so the working out has been put on hold. My calorie intake seems to be working because I've only gained what I was supposed to gain during the first trimester.