Weight loss on quietiapine/seroquel

Hi I'd really like some help, I started taking quietiapine 200mgs when I was 6 months pregnant, I gained 3bs in 3 months, I put it down to being pregnant but I had my baby 5 months ago, my partner is a personal trainer and I have been eating very healthy, no carbs or sugar and do at least 30 mins cardio per day with 3 weight training sessions per week, and my weight has not budged even 1lb in 4 months of training, has anyone else had this experience of not losing ANY weight while eating well and excersizing??please help I'm going insane!