So sorry :(
How long have you been ttc?
I am extremely irregular, and was diagnosed with annovulation (ie I don't ovulate) and like you I found that the ovulation kits useless.
GP refered me to Fertility Clinic after 2 years, but to be honest I hadn't gone to her until then as I kept thinking it would just happen!
I was on Clomid for 6 months, which did make me more regular, but still failed to get preggers.
I went on to IVF, and on the second attempt with a Frozen embryo had my precious DD, who is 14 mo.
All ready to get back on the IVF train (It took 6 years from starting to ttc, for DD) and had an appointment with the same clinic last Wednesday...only to find that I'm pregnant!
So it can happen, I have had 2 periods since DD was born, but only problem is that I've no idea when I'm due!