Mother of one. Diagnosed with PCOS in 2016. I have never missed a period until now. Last period was on the 26th of September 2017. I am now 8 days late, however I think I may have ovulated on cycle day 24 which was october 19th. I took one pregnancy test which said negative but still no period 13dpo.
13 dpo can be an ideal time to check your pregnancy...but I wud say to take a test when you miss your due periods for a week or so.. though you get a regular period even with pcos which is a good sign...just be positive and wait for your due periods to be missed.
If I use the late ovulation date to calculate next period I would now be 1 day late and I'm sure my luteal phase is always the same. I've now had no period for October so I'll wait a week then retest.