First month of pregnancy Weeks 1 – 4
Second month of pregnancy Weeks 5 – 8
Third month of pregnancy Weeks 9 – 13
Fourth month of pregnancy Weeks 14 – 17
Fifth month of pregnancy Weeks 18 – 22
Sixth month of pregnancy Weeks 23 – 27
Seventh month of pregnancy Weeks 28 – 31
Eighth month of pregnancy Weeks 32 – 35
Ninth month of pregnancy Weeks 36 – 40