I think this is worth posting in the Pregnancy forum, as people with CF are often put on a regimen of Ibuprofen. It was not one of the three NSAIDs tested, but it's perhaps relevant nonetheless, especially at the CF dose. And even for CFers not trying to conceive, this may help understand your cycle and it's relationship to your meds (as well as things like weight, stress, and infection).
http://www.medscape.com/viewarticle/846552
"The women were assigned to one of four treatment regimens: diclofenac 100 mg/day, naproxen 500 mg twice daily, etoricoxib 90 mg/day, or placebo.... 'All control patients on placebo ovulated, but ovulation was far less frequent in patients who were on NSAIDs,' Dr Salman reported."
http://www.medscape.com/viewarticle/846552
"The women were assigned to one of four treatment regimens: diclofenac 100 mg/day, naproxen 500 mg twice daily, etoricoxib 90 mg/day, or placebo.... 'All control patients on placebo ovulated, but ovulation was far less frequent in patients who were on NSAIDs,' Dr Salman reported."