C.S.
Check out the book Taking Charge of Your Fertility (www.tcoyf.com). I knew I was pregnant both times from taking my temperature. It also explains how to tell when you are about to ovulate. The book helped save a lot of money on ovulation predictor kits and pregnancy tests - both of which I used prior to the book - as well as the disappointment of a negative pregnancy test. Of course this won't help if you're looking for something to test right now.
Best of luck to you!
C.