5 weeks 3 days.. Too early for an ultrasound?

Jen
Had my first sonogram today.... They saw the sac and the yolk as what they explained ..told me to come back next week to do another sonogram since I'll be farther along.. Did anyone have a sonogram this early and saw anything ? They said by next week I should hear the heartbeat as well.. I'll be 6 weeks 3 days by then.