Hi, how have you been overnight?
If you had a positive on day 32 of your cycle, and say it was an early result, which picked it up at 10 days post ovulation (which can happen), that would put you at 7 weeks rather than 8, which closes the gap somewhat, so there is some wiggle room there.
IME, a couple of times I have had this and they have both led to MC around 8+5, both PG were tested afterwards and found to have genetic problems which meant things were not developing properly, hence them showing behind. For me, bleeding with cramping is also never a good sign.
So as others have said, I would hope for the best but prepare for the worst just in case.
Regarding telling close family at Christmas, would you want them to know if you had a miscarriage so they can support you, or would you rather keep it to yourself, if so I would not tell them just yet to be on the safe side.
Are you under an EPU?
Can you walk in if you have any more bleeding/cramping?
Are there plans to rescan you?
I would possibly be tempted to try and get an appointment to rescan next monday, which presumably would be the last date they would do before things close down for a few days over xmas.
The waiting time is truly awful, I feel for you.