Hey guys, more questions from me!!

I just wondered a few things, firstly the CD21 progesterone BT I'm assuming is meant to be done 7DPO? I ovulate late so mine was organised to be done on CD23 which would make me 6DPO. My problem is that I work on Friday & can't get it done then, so it'll be done on Thursday at 5DPO or then Monday at 9DPO. Would that be ok?

Also if the levels are low will it be written off due to the test being done 2 days early? Or if they are right at 9DPO would that be a problem cos it's 2 days late??

OMG I'm confusing myself! I hope someone understands LOL!