This is a great time to start pregnancy exercises — swimming, prenatal yoga, and walking are all excellent.
The placenta produces more progesterone than the corpus luteum ever could — reaching levels 10x higher than non-pregnancy peak. This is why second trimester often feels dramatically better.
The second trimester
Chorionic villus sampling (CVS) is offered until week 13 for high-risk pregnancies as a diagnostic (not screening) test.
Interactive guide · 40 weeks · Fruit size visualizations · Personalized tips
Explore Week 13 in the Interactive Guide →