25 weeks- stomach cramps

Anyone else experiencing something similar, today I woke up in a lot of pain, almost period like cramps. I don’t really feel any tightening or anything of my stomach with it, just dull aches and cramps that go into my back. This is my third baby and I can’t remember feeling anything like this with my other two other than the actual onset of labor!

Is this normal, should I be worried? It helps to sit down but walking/standing today have been so painful.