Honest to God truth - I would not check my pH after DTD. I think all it does is makes you totally insane over things that are out of your control, and I do not believe for one minute that pH of 5 or 5.5 means you're going to conceive a boy. Semen pH is naturally in the 7's and BOTH X and Y sperm thrive in it - there is no earthly way that if semen pH is in the 7's, that you MUST have very low pH to conceive a girl.