Should I be worried? Please help!

My first post 🙊

This is my first month TTC. I came off BC in July, and have had three, normal, regular periods since then. I have a 26/27 day cycle, with my periods lasting around 5 days each time.

Glow and other fertility calculators say I was due to ovulate around September 12th-17th. I started taking ovulation tests on Sept 14th. They have all been negative!

I am feeling slight discomfort, like a dull ache in my lower left abdomen, I think it's my ovaries. I've had this since Sunday (it is now Tuesday!) is this AF? :(

Does anyone think I have missed ovulation or it's going to be late? It's now Sept 19th and I'm panicking.

BFN This morning, just to put my mind at rest lol. Any advice welcome :)