Most doctors will tell you that you should gain anywhere between 25-30 pounds through out your pregnancy. You should aim to gain about 3.5 pounds during your first trimester, although more often than not most women find that they lose weight their first trimester. The culprit to this is morning sickness. Some women suffer from such a severe case of morning sickness they can not keep anything down. Chances are your doctor will not be too concerned if you lose a few pounds that first trimester as long as you gain steady throughout the next two trimesters. Click here to read more