Mag-o-Overdue na ba ang pagbubuntis ko?

I am currently 36 weeks going to 37 weeks. I heard from my husband friend that seldom women will give birth at 40 weeks.. mostly give birth around 36 weeks to 37 weeks.. After hearing this i am so worried that anytime I will be going to labour. Haiz... so scary feeling that all the unknown pain is coming soon. I have the tightening feeling in between my stomach and chest. When I sit on the chair I am having difficulty breathing..