Walking around and the cramps keep coming back?

I’m 38+1 weeks pregnant.

Yesterday I went for a 2 and a hour walk roughly, as that is supposed to help bring on labour.

3 hours later I started getting lower back pain & cramps with a lot of pressure.

Went to bed as tried sleeping it off. Woke up every hour to use the bathroom.

Woke up this morning and whenever I walk around I get tons of pressure and the period cramps come back.

Signs of labour anyone??