Period not come, POAS was negative

[ConfusedPixie]

Can diet and stress really affect it that much? I was due on around the 20th of Dec. I POAS earlier this week and it was negative. I keep getting the feelings I get when I'm due on, like cramps and an increased appetite but nothing happens. I've gained half a stone or so since September I'd guess, maybe more, but I'm still healthy and my BMI is in normal range.

Any ideas?

I know how you feel i am exactly same dont know what is wrong have dr on wed to check gd luck and if you find out anything new let me know