CM right before AF?

Hello everyone!! I was just curious about something.

So I've been super sick to my stomach for the past few days. AF is due on the 18th.

This morning when I wiped I had very sticky clear CM.

I've never had that other than around ovulation.

Is that a normal thing around AF as well?

(Side note: I took a pregnancy test yesterday and thought I saw a very faint line but it hasn't gotten darker so I think it's just wishful thinking. 🥺)