Prodromal or real?

EDIT: I was indeed in labor!

Hi there, currently 38+1. I had my 38 week appointment yesterday at 10am and as soon as I got home started having cramps that feel like a cross between constipation and period cramps. They've been semi irregular, only having about 3 in a row that have been the same length apart. It's currently 3 am and they have kept me up all night I've been counting for almost an hour and they are ranging from 4 to 6 minutes apart but I don't know if I should go to the hospital. This is my second child my first was induced at 40 weeks with no signs of labor so I have no clue what I'm doing and I don't want to wake my partner, son and mother up for a false alarm! Will real contractions be the same length apart across the board or is a minute difference normal? Please help!