Not gaining weight while pregnant

So i turn 22 weeks tomorrow and i have not gained any weight at all ive been losing weight instead my dr hasnt brought it up with me so im guessing everything is ok and i constantly feel my baby moving so im guessing thats a good thing. But i dont really eat i feel sick when i do i eat maybe 2 small meals a day and i take my prenatals. Any of you ladies lost weight while pregnant instead of gaining?