5 days late!

I'm quite new to this - first cycle TTC - but I'm now 5 days late and getting negative pregnancy tests.  I came off the pill in Oct and my periods have been regular since. This wait every day is agonising, keep feeling like my AF has come and running to the loo, but nothing. Feeling confused 😕 I guess it's normal after the pill for cycles to be messed up? Just not sure how long is normal...any advise would be gratefully received.