First ultrasound 6weeks 6days

Cat

Went for our dating scan today. I have PCOS.. LMP dates me at 9 weeks tomorrow OPK dates me at 7 weeks tomorrow. The abrupt ultrasound woman said there was a baby and a yolk sac but it was little and dating at 4.5 weeks and no heartbeat. Even if i did ovulate later than i thought i got a positive at 9DPO so i cant be 2.5 weeks behind. Trying to be positive but a bit off putting after a chemical in March.