(Unintentional) Weight LOSS during pregnancy

I am 17w3d and down 7 lbs. I haven’t gained at all this pregnancy but my bump is growing. I also failed the glucose one hour test and have to go in today for the three hour test. I have been very nauseous this pregnancy but I haven’t really gotten sick. I’m eating the same as I was prior to being pregnant and haven’t worked out if I am being honest. My weight hasn’t concerned my OB but it is really freaking me out. She said as long as i start gaining after 20 weeks which I don’t see happening? Has anyone else also lose weight in their pregnancy??? Was the baby growing okay??