Hi I'm just looking for advice

My baby is 2 month old when I was pregnant there is 2 dad's in question I slept with one guy on the 23rd April and one on the 29th April I ovulate on the 24th of each month and had a implantation bleed on the 30th I had a scan on the 22nd June and they said I was 7 weeks 5 days pregnant which would be perfect for the first guy but I'm starting to question if the scan could of been a week out ? And do they add the 2 weeks everytime even if u have a dating scan early on and if I was 6 weeks 5 days pregnant would u see much ? My scan is prettydetailed