Real bad exhaustion and RLS

Brittany • Mommy to a wonderful 12yr old boy, 9yr old boy 7yr old girl 6yr old girl and 3yr old girl. Due March 11th 2023 with a boy.
I go to bed around 8pm and get up around 7:30am yet I'm so exhausted to the point of feeling sick and weak and get real bad RLS that only goes away with sleep. I take my prenatal vitamin and still feel awful. Anyone else going thru this? I didn't feel like this with my 1st pregnancy.