See our pregnancy weeks to months chart, find out how long a trimester is, and learn how to calculate your due date. Baby Center. Pregnancy in weeks, months, and trimesters.

Scans and appointments at 5 months pregnant "One of the key milestones at 5 months is your Mid-Trimester or Anomaly Ultrasound Scan, offered between 18-21 weeks of pregnancy to check your baby’s ...