AF is 3 days late ...

Whitley

AF is 3 days late, I've been cramping and feeling bloated like I could start at any second ... but the last few times that I have went to the bathroom, when I wipe there is a good amount of thick stretchy CM. Almost similar to fertile mucus but I'm due for my period? I took a test this morning and it was negative. What could this be? I'm confused! TIA. 😊