Fingers crossed that everything goes ok at your scan x my sis in law had an early scan and was told she was 2 weeks earlier than she had calculated. she didn't think this was possible as had positive at 4-5 weeks. she had had spotting too. she has since had 12 week scan and dates are still 2 weeks almost behind what she thought, but baby is growing ok.
I don't want to give you false hope, but every body and every baby is individual, and stress can make things worse.
Think you've got the right idea with what will be, let us know how you get on, will be thinking of you xxx