The uterus grows exponentially during pregnancy. Most people wonder how big this organ is during pregnancy. Before pregnancy, it  is located  deep in the pelvis and about the size of an orange.
 

Uterus size during the first trimester

Around pregnancy week 12, the uterus starts to grow upwards and out of the woman’s pelvis even though it may still fit into the pelvis. It is about the size of a grape fruit. It will start growing and stretching sooner  if you are carrying multiples. Your health care provider will feel it by touching your belly.

Uterus size during the second trimester

The uterus will becomes as big as the size of a papaya during the second trimester. It will no longer fit the pelvis and will be found situated midway between your navel and breasts. The growing uterus pushes organs out of their usual places and place tension on surrounding muscles and ligaments. This is what results in some of the aches and pains during pregnancy. Your navel may stick out due from uterine pressure  but this will return to normal after delivery of the baby.

Around pregnancy week 18 to 20, your doctor will start to measure the distance from your pubic bone to the top of the uterus ( fundus)  in centimeters cm. This measurement is known as fundal height. The  number corresponds to the pregnancy week, give or take 2 cm. If the number is 34 cm, it means you are 34 weeks pregnant. You may measure a little bit higher if this is not your first pregnancy. This measurement  gives an idea how pregnancy is progressing. If the measurement is too big or too small , it may be due to pregnancy complications or that your due date is off. Further testing will be done.

Uterus size in the third trimester

Your uterus will be  about the size of a water melon in the third trimester. It will also  stop growing. It  will extend from the pubic area to the bottom of your rib cage when you reach  full term. As you get ready to deliver your baby,it will drop lower into your pelvis

Uterus size after pregnancy

After pregnancy, your uterus will return to its original  size and position. This deflation process  is called involution. It usually takes about 6 weeks to complete.