Surprise!!

Hey ladies. I've been creeping and lurking on this site since before I even had surgery. My husband and I have been TTC for almost 12 years and have tried clomid and femara unsuccessfully. I had RNY on Jan. 28 and have lost 45 lbs. About 3-4 weeks ago I began to get very nauseous and would vomit, gag and dry heave all day. Zofran did not help at all. Last Saturday I had a dream in which I took a pregnancy test and it was positive. So that Sunday I decided to indulge in my curiosity and take a test. It was positive! As well as the 6 I took later that day! lol! Went to the doc yesterday where pregnancy was confirmed by blood and ultrasound. My question is...I can only manage about 3-500 calories a day. What healthy things can I eat to make sure the baby survives? I don't see the nutritionist until the end of the month (she's booked solid) and should I slow down on exercising so that I may hold on to the few calories that I am eating?

I meant to write...confirmed by blood, not by ultrasound.