hi noknok,
i read that it's normal not to gain weight in 1st trimester especially if you're having bad ms. some people even lose weight! i haven't gained much weight either cos felt so sick after eating that i ate very little, imagine, for a few weeks, i only had fruits cos that's all i could eat without feeling sick. but you should be gaining more weight in the 2nd trimester when your ms subside.
xbeanniex, yes, i'm farting a lot too, quite embarrassing right? this is because our stomach is taking longer to digest the food, that's why we burp, fart more.