Thanks for that very interesting info. girls. I had been wondering the same thing myself Angel - as I had a 16mm follicle on my ultrasound on Wednesday and told the guy I expected to O in the next few days and he said "that looks about right". I haven't had a positive OPK yet and I really would have expected one so maybe this evening it will be positive. I am not on any drugs. So Angel, looks like we are almost on the same CD.
Good luck with the BDing - I love it when BD time happens on the weekend. Seems to take the pressure off a little.