Fertility Tests vs. Ovulation Prediction

The NYT wrote about First Response's new fertility test, notable because we get a whole lot of fertility questions on HBN.com. As I've learned from Pee on a Stick, ovulation prediction kits tests detect lutenizing hormone (LH), which surges before ovulation and also helps maintain early pregnancy. The problem with a test that detects LH is that the test will show you as ovulating if you're pregnant. Fertility tests that detect FSH will avoid this problem. I'll definitely have to learn more about how they work!