First Time Mom

I’ll be 40 weeks in 3 days I’ve been experiencing back pain, abdominal cramping and my stomach continues to get hard could this be labor it’s so hard for me to talk to people here and there and my breathing is changing also feeling nauseous. I live 35 mins away from hospital what do you girls think is best to do.. i had a normal morning but decided to walk some stairs about 10 flights plus walked around the neighborhood. Started experiencing pains since 3pm and is still going on now also took a hot shower to see if that would help it hasn’t!