I'm five mnths pregnant and my stomach isnt hard. L also cnt feel my uterus below my belly button. Is this normal?

Well... First, are you certain of how many weeks along you are? At 20 weeks gestation (about 5 months), we expect your uterine fundus to be as high as your belly button. Some women carry their pregnancies in a very "posterior" fashion, so may not "show" as much as other pregnant women. However, your physician should be able to feel the fundal height at this point; check with your doctor.
Yes. But to be safe and for your own level of well-being please get in to see your obstetrician asap.