Pretty sure O'd when ttc DS.
DH and I tested this O theory using condoms to avoid the added pH increase of semen.
When I didn't O, pH stayed the same: about 4.
When I did O, pH increased to a 7!!!
Since pH is such a huge factor in swaying- it's obvious that it would be better to not O and keep pH as low as you can.
You can always test it out! (What fun!) If O's for some odd reason don't increase your pH then feel free to O.
But, when you find that your pH does spike, at least you will feel a little bit better knowing that this "abstaining" is for the sway... another torturous part of the sway!