Out of energy???

Whitney • Proud mom of 3 year old baby girl and baby boy due in December.
Im 4 weeks 6days. I am totally dragging I slept until 9:20 this morning. I usually get up by 8:00. Throughout the day I am so drained. I also have a 3 year old daughter. Who is all over the place. Is there anything I can take or eat for energy? And should I be picking her up? She weighs about 35 lbs she all of a sudden wants to be help all the time.