Confused

I’m just looking to see if anyone else has experienced this. I got a positive pregnancy test on November 14th. I was pretty positive that my last period was September 19th. I went to the doctor on November 17th and he said that the sac was flat and that I was having a miscarriage. He wanted to see me on November 23rd to confirm and schedule a D&C. I went on the 23rd and the sac was more circular and measuring 5 weeks. He said it’s a blighted ovum and was sure that nature would take its course but scheduled me for yet another ultrasound on December 7th. I just got married and life has been crazy and after thinking about everything, I remembered having a period around October 6th. I called to tell him that I was wrong on the date of my last period but he says that he’s still sure he would be seeing something on the ultrasound by now. I still haven’t had any cramping or bleeding or any sign of a miscarriage. It’s actually been the opposite and I’ve been experiencing more pregnancy symptoms and my test lines keep getting darker. Is it possible I could just be really early and that’s why he isn’t seeing anything? I’m just stressing out and wanting some answers so bad. Just trying to see if anyone else has experienced anything similar.