Low BMI and previous epilepsy to pregnancy

I knew I’d have to see someone about my weight but I’m not 100% sure what they will do. I’ve always struggled with my weight but I’m 25weeks and still classed as underweight. I’ve got 2 more scans booked and I’m waiting for an appointment with a specialist...has anyone else been through this and can let me know?

When I was 7 until 11 I suffered from epileptic seizures but nothing since (I’m 22 now), they’ve said I also need to see a specialist about this. Can anyone tell me what will happen from this?