A sign??

...I’m 40 weeks and I’ve had no real signs of labour so far.. I have since last night been having some pains in my vagina/uterus region off and on and a lot of lower back pain/pressure right at the tailbone/top of butt area... I’ve also noticed that there have been quite a few times that my stomach gets very very hard, yet I don’t feel any contractions? Is that normal??