Period like cramps

Just Me • Have a 4 year old daughter and a Newborn GLOW baby girl born 22/04/15..so in love 💕
So I'm 34+3 and for the last week ive had on and off period like cramps and dull backache also at the bottom. For the past three days it's gone worse and is quite constant. With my first (4yeara ago) from what I can remeber i just knew I was having contractions but this time is more of an ache/cramp that a pain.
Could this be early labour?