I'm 39 wks first baby and the past two evenings I've been in pain in my lower back and down below like a burning/stabbing pain, I usually get this pain when walking so presumed it was pressure as MW said head deeply engaged. I keep thinking it's the start of labour but every night goto bed and sleep waking up feelin fine. Last night I really did believe it was starting as it felt like I needed to pass a bowel movement but now I've woke up fine again and thinking is it just usual aches n pains with pregnancy and hoping I'm not being a big baby 