Cervix is 2.23 cm

Kelly
I'm 33 weeks today and went in to get checked after having strong menstral like cramping for the past several days. My cervix is closed but measuring 2.23 cm. Doctor said to just take it easy and stay hydrated. After looking up average cervix length mine seems really short. Anyone have a similar situation? My dr is not very informative or helpful and I just want to know if this is normal or not.