Ovulation date, 2ww and BFP/AF due date

[ItalianWiking84]

This might seem like a daft question but

I had my last AF starting the 17th last month. My cycles is 31 days
I had my smile on the clearblue ovulation stick the 5th of August and according to my math I should be 8po ? But according to my cycles my BFP or AF is arriving Friday, which will be 11po but then that's not 2 weeks or close to 2 weeks, so is my cycles completely off track or was my ovulation date wrongly calculated or?

Just got confused now if there were something wrong?
Please advice

Thanks
:D

I would say, go by your ov date, so your af is due roughly 14 days after you ovulated. It could be that your cycles are not regular or it could be that your calculations are right and you just have a short luteal phase but until you've charted one cycle, you won't know. Of course, if you do get your period this month, that will at least tell you how long your luteal phase is.

As above. You may have ovulated late this month, which would push everything further back. Or, you may have a longish follicular phase (first half, before ovulation) and a short luteal phase (between ovulation and period), in which case you could be right to expect AF on Friday. Just have to wait and see when she shows up. The good thing is, your luteal phase will stay the same every month, or at least within a day either way, so if you work out how long it is this month, you'll have a better idea of when to expect AF in future months. Ie if your luteal phase is 11 days this month, I'd expect it to be no shorter than 10 days and no longer than 12 in future months, though the exact time of ovulation (and therefore the length of the first part of your cycle) may move around.

*RaRaZ thanks for the explanation. I dont think I am wrong with my calculating of AF/BFP date, because since coming off the pill, I have had a 31 day cycles every month and never been late. I came of the pill in April, so have had a couple of months to register it, and it is always 31 days after my previous day one of AF that I get AF again.
But your right, just have to wait for Friday and see what happens