Confirm pregnancy test with bloodwork

Jazmin • Navy wife, mommy to a spunky little girl

So I just found out I’m pregnant, the ob office on our base said I need to get bloodwork to confirm before scheduling my first appointment. With my first I had to wait until 8 weeks and I didn’t need any bloodwork to confirm just an ultrasound. I’m supposedly 4 weeks, should I wait a week before going in to get my Blood drawn or should I just go tomorrow or Monday?