I'm so sorry that the wicked witch arrived. The best days to BD are the ones leading up to 'o' day so that there are lots of spermies to meet your eggy. We BD every second day from the end of AF to 2 days after when I thought 'o' day was with a few extra in the days leading up to o.
So working off a 14 day LP and another 33 day cycle your next AF would be roughy 2nd November so take 14 days off 2nd November and BD for the four days leading up to it 2 days after just to be sure.
Good luck for this month.