pregnant right after mc

hi everyone I'm so lost right now we had our mc on Oct 30th and I got pregnant right away before having a period. i had a VVFP and then 3 negitives and then about a week and a half on day 46 of my cycle when I got my BFP! I have my first scan on Thursday but I don't even have an idea on how far along we could be? any ideas? (I know I'll only get a 100% right answer at my scan)