Pregnancy Week by Week The Second Trimester - Weeks 13 through 27 Week 13 Week 14 Week 15 Week 16 Week 17 Week 18 Week 19 Week 20 Week 21 Week 22 Week 23 Week 24 Week 25 Week 26 Week 27 For More Information: Second Trimester Each pregnancy, expectant mother, and unborn child is different. Your pregnancy may not progress the same as the information found here. The information here is based on the average pregnancy. It's not meant to be a replacement for any advice your may receive from your doctor. If you have any concerns about your pregnancy, we advise you to contact your doctor. CONTENT AREAS Pregnancy Main Page Trying to Conceive Pregnancy Week by Week Labor and Birth Questions and Answers Forum Cord Blood TOOLS Ovulation Calendar Due Date Calculator "What Week Am I In?" Pregnancy Calendar Birth Plans Gender Predictor PICTURES Ultrasound 3d Ultrasound Pregnant Belly Labor and Delivery BABY SHOWERS Baby Shower Planning Baby Shower Games Baby Shower Ideas Baby Shower Food Baby Shower Gifts