overly active 5 year old?

my daughter is 5. she doesn't sit down, not even in school. i don't know what im doing wrong. she's so figgity that she talks in her sleep. i play with her, she goes to the playground almost every day, but its not enough. it takes alot out of me because im 4 months pregnant and i also have a 1 year old son. what can i do? i fear that she may need to be tested for adhd..help!!!!