Preterm labor ?

OK so I'll be 27wks tomorrow n I have this fear of going into preterm labor I was at labor n delivery on Monday because I thought I was leaking fluid luckily it was just discharge n not my water but I did find out my cervix is only 3.2cms they said they like to see anything over 3cms but mine is barely over 3cms n now I'm scared to do anything for fear baby will come early. So my ? Is did anybody find out there cervix was on the shorter side of the normal n carried to full term?