Confused?!

Ovulated on CD18. Period is due to start today or tomorrow. Normally know when AF is coming with cramping and once blood flow starts- it doesn’t stop for a few days. Noticed slight cramping with light pink mucous discharge with wiping today. Put in a tampon and did not even fill in 5 hours. I’m confused, I’ve been extremely fatigued for 4 days (per my husband), stuffy nose and tender breasts. Thoughts? Haven’t tested.