Measuring ahead?

Hi all! I went in for a dating ultrasound at what I guessed was my 8th week. I had to have a dating US as I got pregnant right after a miscarriage without a period in between....

I just had my results sent to me...and I'm dating two weeks ahead of what I thought! This is impossible, as it would have me pregnant DURING my last miscarriage. Plus I had tested negative during that time frame...and my positive test would have been at 6 weeks according to their new due date of April 17!

I guess I'm just wondering...any thoughts? Should I mentally keep my May 1st due date? What the heck?! 😜