Im not really an expert as i dont chart or anything like that,
But i read alot of people test for ovulation, chart temps and check by vaginal discharge also.
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well i got bbt off ebay for £2.00 and buy my opk's omn there too. You just wee on them, i normall do one in afternnon about 2pm and then again about 8pm.
My period is 27th of the month have a average 30day cycle and found out i ov on cd17, but my positive test were cd 14 and 15.