Positive OPK.... 11 dpo .... anyone?

Elle
Ok so I read that LH and hcg are similar enough that you can get cross reactivity on OPK. And I had loads of OPKs in the house so started taking them for fun. Such is my life. Started three days ago - and they've beengetting darker each day until the dark, "positive" OPK tonight. Now, I'm not getting false hope. Really. It's far more likely that I'm not pregnant, and af will pounce on me sometime in next 3 days. I know I'm not trying to ovulate again- I definitely ovulated on time mid-month, temps went up as they should. But I'm just curious...has anyone else had this experience? Any thoughts would be appreciated!