I went to visit my DD / grandkids last weekend. It's a 200 mile journey each way & I usually stay over for a couple of days, sleeping on their sofa.
I had a WhatsApp conversation with DD on the previous Monday & we agreed I'd visit 'next weekend'. I arrived on the Friday evening as normal only to be met by a confused Son-In-Law who was expecting me the following weekend. As always, they were very gracious & re-arranged one friends visit (I wouldn't have minded either way). We had a great time, took the grand-kids / DD out for a meal etc. etc. I've asked a few friends / relatives & opinion is fairly split.
So, my AIBU is,
if you are speaking to someone on a Monday, is 'next weekend' 5 days away or 12 days away
YABU - it's 12 days away
YANBU - it's 5 days away