7 weeks 4 days

Jo

Based on the first day of my last cycle I should be 7 weeks 4 days. I had an ultrasound two week ago and we saw nothing, we just assumed it was too soon to see anything. I went back today and all we saw was a toll sack. Dr. Says there’s progress since we didn’t see anything weeks before, should I be concerned or is this normal in some cases? I have a history of PCOS idk if that can affect ovulation timing.