14w 4d weight loss

So I'm 14.4 and so far I've lost 40 pounds!!! Now with my last pregnancy I lost 70 pounds at the end of the 9 months... But it wasn't this rapid it was gradual over a whole 9 month period!! The doc says he doesn't understand what's going on because I'm not puking anymore I've been eating and I've slacked off on exercise... But all my blood work is normal, thyroids are functioning properly, but he said he isn't going to worry unless the baby isn't gaining weight or is loosing weight... This is just crazy!! Anyone else going threw extreme weight loss and your doc isn't concerned??