warning signs of labour

So previously I have had contractions in the pregnancy around 30weeks. I know what contractions feel like and when I should go to the hospital but I'm curious for all you mommas out there, what were the early warning signs you had that you would be having your little one in a few shorts weeks? Was it acne, or washroom troubles, or insistent cramps? Just want to know what to be looking out for other then the contractions themself! :)