Always dead tired

Is anyone else having trouble finding the motivation to leave the bed?? my brain says "let's do small work outs and tidy up the house" but my body says "no you are way too tired, your eyelids are so heavy just sleep a little longer." But I don't want to feel lazy and not be healthy for my baby. I'm only 6w1d. but I didn't know it'd be this bad so early.