Hey Michelle.

I used OPK's last cycle, for the first time ever. I bought a pkt of 10 online from Downunder. I only got one positive OPK, and it corresponded to the day FF said I ovulated according to my temperatures (and a blood test confirmed that I did ovulate at some stage), so I was pretty happy with them. I think they were about $1.80 each, which was much cheaper than at the supermarket.

I found, though, that I got really really faint lines, until O day which was the same colour as the control line, and then really really faint lines again, so there was no way of knowing if I was coming up to O time through progressively darker lines IYKWIM.