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!
The OPK helps you predict when you are about to ovulate. Ovulation usually happens within 12-36 hours after the OPK first turns positive. many will show a faint line with lower LH levels. If your result line often has significant color, you should consider trying another brand, and if it's still positive for many days in a row, then you may want to see your doctor and test your LH levels on the third day of your next cycle to see if your hormone levels are elevated.