How much weight loss is "normal" during pregnancy?

So, I'm currently 15 1/2 weeks pregnancy approximately. Before I was pregnant I weighed a little over 160 if not 160 exactly. I believe the heaviest I've ever been in around 165. Well now I weigh 144.8. Is this normal weight loss? I can't hardly keep food down that often still. & I only eat about 2 times a day max because of it. I go to the doctor this Wednesday. So I'm going to mention it then. Especially since they'll have a better weight scale to know exactly my weight by the time Wednesday comes. But from what any of you have experience is this normal weight loss during pregnancy?