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!
Many doctors recommend that you wait to take ovulation tests up to four days after the last dose of Clomid has been taken. While these false readings can be frustrating, the end result of taking Clomid can still be a pregnancy, and thus the chance of a false reading should not discourage you from trying Clomid.