US Immigration from Canada

(I don't really know the right place to put this, so I'm sorry if this isn't it.)

My fianc filed for my K1 application back in August (yay!) but throughout the whole I've done a lot of research on different things regarding the K1 process and I have a couple of questions that I can't find a clear answer on.

1. What family preference does the K1 fall under?
I remember when the new preference categories came out due to COVID, there was something that mentioned it was part of the F2A category, but I can't find this information again and I wanted to confirm I'm looking at the right boxes when looking at the visa bulletin.

2. This is the big one: We intended to have a ceremony in Canada, we knew that we wouldn't be able to sign a marriage license or complete the legal marriage process in Canada but we wanted to include my family and enjoy the wedding portion of this process. With that in mind we had planned on having a small courthouse wedding when I arrived in the US after our approval where we would complete the legal paperwork and make things official.
However I've since read that even anything that looks like marriage, without any legality to it, could leave me subject to denial of entry.

I wanted to know how true this is, and what any recommendations might be (outside of the obvious).

[If it's true we would just have the reception/celebration in Canada and take pictures with family and avoid anything that looks like a ceremony, then have a small ceremony in the US instead.]

Thanks in advance for the responses!

I married a US citizen and we went through all the fun that comes with immigration. We filed for myself (Wife) and my daughter(step-child of sponsor) to immigrate.

From the process perspective it never looked like the two were merged, until we got to the affidavit of support, which the sponsor got to fill just one for both of us (and a single fee). Great! Fast forward and my daughter's case required less documents so it was DQ'd back in March. Mine, with all the requests for duplicates and what not took many months more to DQ. There is roughly 6 months between the two DQ dates.

Now what we've run into is my daughter got her IL last week for an interview in Nov but nothing on mine (I'm assuming I'll be 6 or so months after if we go by the lovely spread sheet maintained here on the website which I appreciate!). My dilemma is shouldn't these be done together? If we do her interview in Nov and mine is 6 or so months after her Visa will have expired.

I'm a little at a loss what to do. Anyone have any experience with this? Google and searching this forum, I haven't found any relavant information that could help steer us in the right direction.

Thank you!

Edit: I hope I posted this in the right place.

Is it possible for a medical exam to be done in one day? I just got interview appointment for November 2, 2021. It gives me a little over 2 weeks. Iwas told by the NVC that they always give you 1 month advance notice.The problem is I am in the US and just got my COVID vaccine so I have to quarantine for 14 days when I arrive back to Canada which only gives me 1 day to get medical done. Should I reschedule? If I do, how long is the wait for a new appointment? Any feedback would be appreciated.

Hello guys,

I am about to file for adjustment of status for my wife. She came thru K1. Will she need to get the Covid test before I file for her AOS? She came before October 1st and I am planning to use the medical exam record she got before coming to the US. Thanks

I tried to register my appointment online and it did not accept it. Where can I find the DS 260 number? Any help would be appreciated