First Ultrasound 5 weeks

I just had my first ultrasound today Monday (June 4) and doctor thinks I am 5 weeks based on seeing the yolk sack only and a cyst that I probably released an egg from that she said produces progesterone. I’ve been taking vaginal progesterone 400 mg capsules twice daily.

I’m just concerned that I’m behind schedule on baby because my LMP was April 26 and I had my IUI on May 7. My hcg numbers weren’t high but have been doubling. I go in for another ultrasound next Monday.