Braxton Hicks at 21 weeks?

April • I`m 26 been married for almost 3 years, but together for 9. We have 3 beautiful boys and are ttc for #4, a girl.
I've been having horrible cramping and contractions, sometimes there very painful and I can't work thru them and sometimes there just little quick ones. But they happen pretty much everyday, any time I do anything physical, is this normal? Should I call the doctor?