My docotor told me that it is considered normal for the fundal height to be within plus or minus 3cm of the week of pregnancy you are in. With my first baby the fundal height was heigher then this & I was given an ultrasound to measure the baby. Both are fairly inaccurate measures though. Sometimes the fundal height varies depending on what position your baby is in & if your baby has a growth spurt ...

Enjoy the rest of your pregnancy. Sarah