Missed period?not pregnant🤦🏻‍♀️

Bit confused. My period was due yesterday and yet I have no symptoms or signs of it coming🤦🏻‍♀️

I had unprotected sex on the 2nd of December before I was ovulating and I had unprotected sex a week ago, a week after my fertile window.

Normally I get a bunch of symptoms before my period but other than being a bit irritated and my skin being a bit rubbish I’ve had none of my other usual symptoms.

Just for reassurance I took two pregnancy tests about a day or two apart and there both negative🤔 is there any reason my periods late or should I be doing something to help bring it on🤦🏻‍♀️ it’s stressing me out aha