My ovulation is really confusing as you can see from my other post, but I was on Chlomid on and off for a total of 12 months before I got pregnant with my
twins, I took chlomid days 3-7
and my first pos. OPK was always on day 12, but the confusing part is that I also always got a pos. OPK on day 14 as well. I wish I could be of more help, but the cycle I concieved my twins on I had my IUI done on day 14 or 15 I believe if that helps at all.