Trying to be calm

I just found out that my now ex boyfriend and babies father cheated on me. I'm extremely heartbroken and with all the other stress I had going on in my life tho felt like the last straw. Im currently 31 weeks pregnant and I have been trying to stay calm so I don't upset the baby but I feel contractions coming on and they're painful. What are some ways I can calm down so I don't stress myself or the baby?