How do I control this horrible weight gain 😭

I've always been super insecure about my body, and have worked hard to lose weight. I'm a veterinary technician so I walk 2-4.5 miles a day at work and do heavy lifting. I'm 7 weeks pregnant and have gained 6 pounds!!! 😱 I don't feel like I'm really eating any differently, and haven't had any bad morning sickness. I feel like I may lose my mind with this!! My pants are barely fitting. 😢 I'm super scared of getting gestational diabetes, since I'm already insulin resistant, I'm on metformin to help with this. Any reassurance/advice would really be appreciated. The photo is of me Friday