20 wks and tired

If I hear one more person tell me that in the second trimester you have so much energy I will go crazy on them. My first trimester I was so sick I couldn't even drink water and I LOST weight. Now that the sickness slowly (VERY SLOWLY) subsided, I am so tired I can barely do any task without getting overwhelmed with fatigue. I also started this pregnancy at about 140lbs and have only gained about 7... Is that okay? Has anyone else found themselves SUPER tired in their second trimester?