period like cramping

Is anyone else having period like cramping??I'm 36 weeks and it's been happening every morning for the past week and sometimes happens later in the day. They get really bad and then I can feel it in my back it lasts about ten minutes usually and stops. It's happening to me now but it has let up a little bit hasn't gone away fully. I've googled it but haven't gotten any real answers what should I do?