Confused . . 😕

I'm 40 weeks pregnant & 3 days overdue but today I have been feeling weird! I've been having on and off again back pain and when I woke up from a nap and got up to go outside , I felt a lot of preasure and then it went away . So I ate , and got up again and I felt some more preasure . . My back pain has been on and off all day and there was back pain with the preasure . Does anyone know what's going on ? Should I go to  L&D or ?