Gestational diabetes

So I went to my appointment for an ultrasound I’m 34 weeks, and they are now worried about her. I was diagnosed at 28-29 weeks, and she weighs 6lbs 1oz at 34 weeks. My boyfriend told me that it’s my fault she’s huge and started yelling at me in the office room. They are thinking I might have a c-section. I’m just so done.. we’re in the car right now and is doing but yelling at me in front our 2 year old daughter.