how many weeks are you when you get out of your first trimester
First trimester ends at the end of your 13th week. Count 12 weeks, starting from the day of your last period. At the end of your 13th week you have started your 2nd tri-mester. Your first trimester ends at the end of week 12,and your second trimester starts at the beginning of week 13 and continues until week 27.
First Trimester (week 1-week 12) At 4 weeks: Your baby's brain and spinal cord have begun to form. The heart begins to form. Arm and leg buds appear. Your baby is now an embryo and one-fifth of an inch long. At 8 weeks: All major organs and external body structures have begun to form. Your baby's heart beats with a regular rhythm.