Lisa,
You would seem to be one of those women who always have a second line on your opk's. That would make it more difficult to use an opk as a guess to pregnancy - as it only really is a help to those of us who only get a second line around ovulation. For those of us that only get a second line around ovulation to suddenly see a second line again around 9dpo is a definite curiosity inducer!

Even though we all have LH in our bodies always, for many of us it only gets to a level to give a second line on our opk's around ovulation time. (or in pregnancy)
My last 5 pregnancies have been indicated by second lines on opk's. Remember though like Sezjm I don't get a second line unless I am ovulating - at all! I get a second line on opk around 8dpo and slowly it gets darker. A couple of days of darkening lines and I test with a hpt and I have been fortunate to be pregnant. We will all have different stories and experiences - that's what makes Belly Belly so interesting and diverse!

However, even then as I said you can't use opk as a definite diagnosis for pregnancy. Only a hpt can remove all doubt!