On all three Clomid cycles, I saw a positive OPK (ovulation predictor kit) at cycle day 15, meaning that ovulation would come approximately 24-48 hours later.
With this being a natural cycle, I had no idea if I would ovulate or not. Since I don't think I ovulated at all before the Clomid, I wouldn't have been surprised if this cycle was the same.
But, I was testing, hoping to see a positive the last few days or so, and today, on cycle day 15, I got it!
Being able to tell if an OPK is positive or not can be really tricky. With HCG, or pregnancy tests, just the presence of a second line indicates a positive. With OPKs, there is always a second line, the test line, and it has to be as dark or darker than the control line. You could see where the confusion would come in.
Luckily, some smart person invented a digital OPK to make it simple.
Well, I hope I helped educate on OPKs a little bit!