Hello mommies and future mommies to be ; ) If you are trying to get pregnant, as I am, I highly suggest using ovulation kits. The calculators are good for getting a projected day you could possibly start ovulating but they are sometimes off by a few days which could keep you from getting pregnant. I have found that I usually ovulate 2 to 3 days before my projected ovulation date. It can get a little expensive, expecially for those of us who have been trying for several months maybe even a couple of years but it is very important to have intercourse right before and on those 2 days you are ovulating. Good luck to you all and may God bless all of us.