They say that each pregnancy becomes more painful with the stretching and BH come earlier but when should i start to worry and get checked out?

I've been having BH and tightenings for a few weeks now, they just came every so often and usually at night. But today they are quite regular and quite painful. They are in my belly as well as my back is cramping.

I did have some green blobby mucus the last few days that resembled my plug with DD.

I'm a bit sore 'down there' and it feels weird.

I just don't want to rush off to the hospital if its normal.