I don't understand

Today I'm 14dpo. And today also makes two days AF is late. I don't understand why I keep getting vvvvvfl it's starting to worry me. I thought by now if I was pregnant it would be showing up, then again I don't believe I O'd on the say Glow Said I did. I was just wondering has anyone else had this happen and still be pregnant so far I know I'm not out with AF being 2 days late, I've been having terrible back pain, my cervix is low closed and firm, I have light creamy cm. I've had horrible headache my boobs are beginning to hurt and I've had cramping for a while now since 6dpo I believe I know it was early on when I got them. Can someone please tell me if ya'll had this happen