zkell i have had a simular experience the first month i was on 25mg's and i didnt 0 then the next month i was on 50mg's and i did 0 and i didnt even know as we had a terrible loss in the family and we were in the ICU etc (thats a whole other story) so of course no bd was done at the right times.Then the next month i stayed on the 50mg's and we bd right through thinking we had a great shot then he said i didnt 0 i was so disappointed.So this month im on to round four af only showed her ugly head today on cd 36 which is really late for me and im starting 100mg's this time so fingers crossed it will work!
Which cycle days do you take it from as i take it from cd2-6 and i have read it had a higher success rate and should make you 0 earlier too check with your fs next appt anyway.
Best of luck to you and i hope you get your BFP you deserve real soon
Take Care
Kristie