16 DPO & BFN &... no AF (ready to pull my hair out)

Br
Here we go again.. Month 2 of TTC. I had one week to visit my husband overseas on his deployment. Luckily, I ovulated the day before I left, on April 22 (I took an ovulation test). According to glow and my usual cycle, I was supposed to start  AF yesterday, but she never came 😁.. (Fingers crossed)
However, I have been testing since 9DPO and have yet to get a + result. I do feel a very slight cramp on my right ovary, and my breasts are very slightly sore to the touch & do feel fuller. I randomly get very slightly nauseated after some meals (only for the past 3 days). This doesn't really feel like my usual AF symptoms, I can usually tell a few days before. 
I keep reading that you will get AF 12-16 DPO. Has anyone had any specific experience with this? With both positive results, or actually getting your period after 16 DPO? 
I'm just confused.