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!
Then it takes another week for the body to build up enough of the chemical (called human chorionic gonadotropin or hCG) to register on a pregnancy test. In other words, it takes about 2-3 weeks after ovulation for the chemical to show up in the body, or about one week after a woman should have gotten her period.