I used sylk as a lube when I conceived my DD. I did a one time cut off 2 or 3 days before I O'ed. I think syll kept my ph the same. Might have raised it a tiny bit. Had to use small amount of lome douche until I O'ed though because I had a lot of Ewcm to wash away and ph to lower. This time I only used repHresh and antihistamines and found that my ph stayed low and think/sticky creamy cm. Using repHresh really decreased stress level. Also dtd closer to O decreased the stress of having to keep ph low after my cut off through O. Was constantly checking ph! Haha. Hth