The embryo forms three germ layers (ectoderm, mesoderm, endoderm) that will develop into organs. Light spotting might occur due to implantation. Take folic acid to support growth.
Normal Period Flow
Baby Growth Stages
Week 13 - Rapid Growth Phase
Pregnancy Basics
Cycle Start Guide
Week 27 - End of Second Trimester
Week 15 - Hair Growth Begins
Week 29 - Lung Function Improves