Hcg level 4, 269 at 6 weeks 3 days. Progesterone 6.7- ultrasound yesterday- yolk sac, fetal pole, flickering heart. Is this on par for 6 weeks 3 days?

Yes. Be reassured by seeing a heartbeat. That is more important than the lab work now. Congratulations.
Probably less. Hcg at 5-6 wks should be 10, 000-100, 00, 4-5 weeks 1000-50, 000. At 6wks 3dys the crl should be 6mm. Sounds like the pregnancy is less than that. Most important thing is fetal heart activity. Good luck!