Tracking Ovulation

Yesterday was day 10 of my cycle. I normally don't start testing for ovulation that soon but all the signs were there. When I tested yesterday morning around 10 it was neg, at 4:30 it was positive for high LH surge.  Of course we BD immediately after testing.  Out of curiosity I tested again at 7:30-8 and it was more of a faint line (no where near as dark as the 4:30 test) but then this morning I tested again and it was just as positive and dark as yesterday's test.  Can someone please explain this?  I thought once you got the positive for the surge that you ovulate 12/24 hours afterwards and there is now more positive LH test.  Just trying to figure this out because we have tried for months and months to conceive, with no luck.  (I've also never ovulated this quick in a cycle)