If you and your partner have been trying to conceive for some time, the book Taking Charge of Your Fertility, by Toni Weschler, offers instruction on how to chart your basal body temperature and note other physical symptoms to predict ovulation.
Exercise will keep you strong and energetic during pregnancy, but starting from scratch would be tougher than maintaining a regimen to which you've already committed. Why not start now by putting on your walking shoes? Walking is a low-impact exercise that will be easy to continue throughout your pregnancy.
If you're trying to conceive, experts suggest having intercourse every other night. As there is a window of a few days leading up to ovulation when a sperm could survive while waiting for the egg, having sex every other day as opposed to randomly will increase the chances of sperm and egg uniting.
Are you planning to have several children? Look for the eldest to be your biggest support -- and your biggest fan. Firstborns tend to identify with their parents, align with authority, and support the status quo.
Are you a twin? If you are a fraternal twin the likelihood of your having twins is high. A woman who is an identical twin has no better chance of producing twins than any other woman who shares some of the same "risk" factors, such as increased maternal age. A woman who is a "fraternal" twin also has an increased chance of having a multiple birth.