Be prepared to show return ticket. Show ties to Canada if possible. And better to use the term boyfriend and girlfriend if k1 isn't applied yet.
Be sure to show touristy plans and definitely no working.
If u want to apply k1 it's OK too,
I was traveling w my son when k1 was pending, pulled to a side to explain. I didn't like it but I had return tickets, property and full time job back home. We also only visited for 2 weeks for Thanksgiving. Good luck!