If you're pregnant and aren't quite sure what is going on in your body, I suggest you check out a pregnancy calculator. Those things are amazing, and can even go so far as to give you a pretty good idea when you conceived if you haven't got a clue. All you have to do is find a pregnancy calculator, enter in the date you conceived (or if you don't know, the first day of your last period) and a ton of information will be returned to you.

For example, I found a pregnancy calculator online and entered the first day of my last period as April 20th. After a few seconds of processing, it told me that my conception date was May 5th (around two weeks before my next period was to start). It then went on to tell me that my greatest risk for birth defects was in the range of May 25th to June 29th. My baby's fetal organ formation begins around May 25th and it's major organs have formed by June 29th.

Also, I learned that the risk of miscarriage decreases after July 13th. Even cooler, I found out that if my baby was premature but born after September 28th, he or she has a chance to survive. About a month later, the third trimester begins and my due date is January 25th. Pregnancy calculators are honestly an invaluable tool for any expecting mother. They can tell you a lot about your baby, way before an ultra sound can. While you're thinking about baby names, it's comforting to know that as the days go by the premature baby date your baby's chances of being born healthy are improving. All in all, pregnancy calendars can be fun and informative, and there's nothing not to love about them.