1st day out of the green and into the blue for me?!

Kylie • Mum of 3 TTC #4 1st baby 2007 2nd baby 2009 3rd baby miscarried 4th baby rainbow baby 2012 chemical August 2016.
So left the green ovulation window today n enter the blue before pink period window, now my periods are usually 28 days but last one was 33, if it's 33 again I be due on in 12 days if not  n its 28 days I be due on the 9th, today I have terrible cramping n back ace, what date should I take pregnancy test?!