it seems there is a lot of negatives with MB. i used it first time last month but didnt get ferning when other signs indicated O and got ferning toward the end of my cycle when i knew i had definatley O'd.
and this is our first month of TTC and i am on CD9 and just got partial ferning (which is confusing me cause O is usually CD15-16)
so i guess doing the temping, OPK etc is needed to get a clearer pic on everything.