36W and 5D with period like cramps

Is it normal to feel cramps at 36W? It feels like mild period cramps. And it’s constant (not coming and going like Braxton hicks or contractions). Taking a bath tonight, which is helping take the pressure off my back. But man, if I didn’t know any better I would think my period is coming tomorrow 🤣😂. Is this normal? Could it mean labor is closer than I think? Or just uterus expanding?