Real contractions or not?

Holli
I can't tell if I'm having actual contractions or not. They definitely feel like period cramps, but I timed them for an hour and they happened about 5-7 minutes apart.. Been losing my mucus plug piece by piece since last night. 
The pains don't seem to get stronger. Some are and some aren't quite as bad.. But they take my breath away a little and I can't feel them in my back so much as I feel the pressure in my butt!
Don't know if I should be worried or not.
They dissapated in the bath for about 20 minutes, now they are coming back as soon as I got out.
Hmm?
Due in 3 days.