I’m guessing I’m 4 weeks and 2 days sac is measuring around 5-6 weeks with a irregular shape.

Help!!!! I am 19DPO however many weeks that is. we seen an empty gestational sac measuring at 1.52 cm. The doctor said my sac is measuring between 5-6 weeks Has anyone had the same issue and have successful pregnancy stories?  in June 2024 I had a chemical pregnancy in October 2024 I had a 7 week miscarriage. I am scared!!!!! a friend out mine after seeing my bbt chart thinks I am 5 weeks.