Thanks for writing to us.
At 6 weeks, a sac with yolk sca is seen. Fetal node and cardiac activity is visible in some cases. It is best to go for a repeat scan from a radiologist
to have complete and deatiled findings recorded. The operiod of gestation is calculated from the last menbstrual period and not from ovulation.
I hope this information has been both informative and helpful for you.
Dr. Rakhi Tayal