Surface water movement takes place in the form of currents. Currents move ocean water horizontally at the ocean's surface. Surface currents are driven mainly by the wind. Other forces such as the Coriolis effect and the location of landmasses do affect surface current patterns.
If the line is darker I would assume a BFP. Normally as Ovidrel leaves your system the line will get lighter. I was told by my doc that it could take at least 10 days to leave your system...which is why we're not suppose to test before day 14 (like any of us can wait that long). Congrats and best wishes to you!
Which means I implanted around 12 days after I ovulated (13 days after sex). Which means my hCG doubled over the next 2 days and that is why I got a positive pregnancy test at 14 days after ovulation (Remember, I ovulated the day after I had sex).