Please read, I need your thoughts!!

Today I went for a scan and there was a sac and a yolk sac.. The twist is I have a 34 day cycle.. and got a pretty decent positive 6 days before my period was due.. so I thought I may have ovulated earlier than expected because I don’t track my ovulation, the size of baby’s sac is measuring exactly to my period cycle, witch means from when I ovulated to when I got my positive I probably implanted 4-5 days past ovulation, witch is impossible or very rare!! I know nothings impossible but it’s rare, has this happened to anyone else?

Last period was 17th of March, lasted 4 days on a 34 day cycle, ovulation was predicted 5-6th of April and got a positive pregnancy test on the 12th of April? I’m kind of in shock? Unless the baby’s not growing? I go back Monday to see if everything’s ok. When I put my period dates and cycle length in the online calculator it say “congratulations you are 5w2d” witch match the scans measurements. I went a week and a half ago thinking I was further a long but they seen nothing witch means the sac has grown as i seen it today, I’m kind of in shock. I’m hoping it all goes well on Monday.