Weight loss during pregnancy?

I am 13 weeks, 3 days pregnant with my 1st pregnancy. I have had nausea since week 5 and I was prescribed Zofran, but it doesn't help. I am not vomiting (thank God!) but I do have severe nausea almost twice daily. I can't eat or drink because of that. My OB and PCP don't really seem to care- we are new to the area. I have lost 10lbs since becoming pregnant with just nausea due to not wanting to eat and I'm also having issues staying hydrated. 2 days ago I got my 2nd IV for dehydration. Nothing settles with my stomach and I've tried preggie pops as well as anything else you'll find online or in books. I was wondering if I should be concerned about the weight loss??? Thanks.