When should I test

Sarah • Mother to George Owen 21/3/18 💙 Pregnant with Baby Owen #2 29/10/19 💙

I’m now on cycle day 36, AF is 4 days late. I tested 2 days ago & it was negative. When should I test again?

My periods have never been this late, only time it was late & I was pregnant with my son & I got a positive straight away. This has never happened to me before