Am I pregnant?

So I need a bit of advice please,

I’m 4 days late for my period, I’ve had symptoms such as nausea, headaches, tender breasts, a tiny bit of cramping , mood swings the lot.

However I’ve taken a couple of pregnancy tests and it says negative, i understand stress and anxiety can delay periods but I know for sure they don’t cause half of the symptoms I’m getting...

Is it worth going to doctors and requesting a blood test to see if I am pregnant or waiting a while? my period is never this late and it’s starting to concern me...

Thankyou in advance