5 days late, BFNs, and pink cm after sex

Naira
Like the title says.. I'm 5 days late and I am very regular.. I've tested several times after my first day of AF not showing up. I feel nauseous during the day and have mild cramping at times. Today my husband and i had sex and I noticed a pale pink cm when I wiped.. what does this mean? Has this happen to anyone?