Exhausted

Help! I'm just so, so tired. Just walking dead tired. I'm sleeping a full night and napping when I can. Eating regularly, drinking fluids, taking prenatals, iron supplements, the whole nine. I can't focus at work and then when I get home, all I want to do is curl up and die. My son is 16 months old and very active. It's not fair to him.I wasn't this tired when I was pregnant with him. My husband is present, but he's doing a lot of the cleaning and cooking.