Pregnancy: Week By Week Calendar

Week 1 - The Journey Begins | Concept Preparing

Week 2 - Conception, Ovulation and Fertilization

Week 3 - Baby: Embryo Exists | Mother: You've Conceived

Week 4 - Implantation

Week 5 - Mother: You're Late | Your Baby's Brain Divides

Week 6 - Baby's Skeletal Systems Develops | Mother: You're pregnant

Week 7 - Baby: The Beginnings of Major Organs are Present | Mother: Start to Eating Healthy

Week 8 - Ultrasound: Baby's Heartbeat Visible | Common Symptoms Occurs

Week 9 - Mother: Get Ready for Hormones | Baby: The Embryo is a Fetus

Week 10 - Mother: Body Changes | Baby: Fingernails and Toenails Appear

Week 11 - Mother: Started Practicing Kegels

Week 12 - Baby: Lanugo Appears on Body

Week 13 - End of First Trimester, High-Risk Period Is Now Over

Week 14 - Mother: Increase Your Caloric Demands

Week 15 - Your Baby is About Four inches Long | Clothes Beginning to Feel a Little Tight?

Week 16 - Handprints and Footprints of a Baby Appear

Week 17 - Mother May Notice Breast Changes and Weight Gains

Week 18 - Your Baby can make Big Movements | Prenatal Tests Are Actual

Week 19 - Baby Practices Breathing Movements

Week 20 - Lanugo Forms From Sebum and Skin Cells to Create Vernix

Week 21 - Baby Begin to Settle in a Head Down Position (Usually)

Week 22 - Baby's Eyelids and Eyebrows Develop

Week 23 - Pregnancy Complications May Dictate You Down | Your Baby Weighs a little over one Pound

Week 24 - Baby Is Almost Completely Formed | Mother: It's Important to Keep Your Body Healthy

Week 25 - Baby Responds to Sound | Mother: Don't Forget to Relax and Pamper Yourself

Week 26 - Baby's Brown Fat Starts to Develop | Mother: Manage Your Stress

Week 27 - Baby's Toenails and Fingernails Appear | Mother: Calming Pregnancy Fears

Week 28 - Baby's Eye Lashes Are Developing

Week 29 - Baby Weighs about three pounds

Week 30 - Baby's Teeth are Visible | Mother: Your Posture Is Important to Your Comfort

Week 31 - Baby: Testes Descend this week

Week 32 - Baby Has REM sleep | Mother: Pain Management During Labor

Week 33 - Baby Practices Breathing Movements | Mother: Start to Prepare For The Big Day

Week 34 - Mother: It's Good If You Start Perineal Massage

Week 35 - Baby Weighs About Five Pounds

Week 36 - Baby's Gastrointestinal System is Developed

Week 37 - Baby has a Sleep and Wake Cycle

Week 38 - Is Baby Dropped into Your Pelvis?

Week 39 - Baby Is About Seven Pounds | Mother: Rest and Prepare For Baby

Week 40 - Mother: Look for Labor Signs

Week 41 and 42 - How to Start Labor if You are Past Due | You're Past Your Due Date

For much more information:
http://pregnancy.about.com/od/yourbaby/a/pregcalendar.htm
http://www.whattoexpect.com/pregnancy/week-by-week/landing.aspx
http://prenatal-health.suite101.com/article.cfm/pregnancy_week_by_week_series
http://www.babyzone.com/pregnancy/trimesters/week-index