Trying to get pregnant is an exciting experience, so why not keep a written record-it's a good way to pass time in this interim period while you're waiting to take a pregnancy test. Rather than just noting down the dates of your period and signs of ovulation, use it to record the highs and lows so far.
Once you're pregnant, you can continue to use the diary to record your feelings: for example, your emotions when you saw the positive symbol on the pregnancy testing kit; how you broke the news to your partner and his response; what your baby's first kick felt like; the best and worst aspects of being pregnant. You may also find that letting off steam about your partner's quirks or your mother-in-law's idiosyncrasies is surprisingly therapeutic!
Besides providing a unique record of your pregnancy, keeping a journal can also help you in subsequent pregnancies: for example, you may find it reassuring to look back and find that morning sickness was just a phase.