Plus size pregnancy

Before getting pregnant i was trying to lose weight and i just recently found out we are expecting😍😍 I’m a little upset with myself that i didn’t get my weight loss down sooner and feel horrible that my weight may make this pregnancies difficult! My BMI is 49! I read online that it is still possible to lose fat while pregnant, has anyone done this? Anyone overweight and had a healthy pregnancy? I know i should be happier and i really am but there is a part of me that feels sad 😞