Is she or isn't she?

I have learned, over the past month, that three distinct scientific methods exist for determining whether a woman is pregnant.

1. Ask her if she is pregnant. (I don't recommend this method under any circumstances.)
2. Ask her friend if she is pregnant. (Okay, but sort of the chicken way out.)
3. Ask her a different question. (My favorite! Goes something like this - "Sooooo, anything nnnnnneeeewwwww going on with YOU lately?)