Possible Late Ovulation?

Ok, bare with me. I have 2 kids already. With both of those pregnancies I tested a week before my period & got positives right at the 3 week mark. With my current pregnancy I tested at the 3 week mark and it was negative and negative for the next couple of days. I then missed my period and tested positive at 4 weeks 2 days. My tests are dark now (dye stealers) and I should be almost 6 weeks by LMP but I work in radiology and my US coworker took a peak yesterday (abdominal - I’m very thin) and saw nothing but thickened lining and a cyst on an ovary, no sac. Could I be a week behind and less than 5 weeks instead? I had sex on 5/1 which would match up with my LMP but also a week later on 5/8. I’m stressing myself out. 🥴