Doc sending me to an ultrasound specialist becouse my belly measurements show that am bigger then what I should be at 19 weeks anything to worry about?

Wasted Energy. Worrying when everything is being done correctly is just a bit of wasted energy. As you grow older you may come to learn how to manage these 'bumps' in life without spending much time worrying. It sounds like the doctor has responded appropriately to an abnormality and has in place the testing to figure this out. Sounds like all is being done correctly.