Contractions?

Alayna • Currently pregnant with twins! Mommy of two angels, McKenna Copeland; 1/15/14 & Gabriel Ryker 4/19/15
I've been having painful cramps, like period cramps, for about 3 1/2 hours. They last about 6 minutes and then stop for 15 minutes and then repeat. Could this be real contractions? I've had Braxton-Hicks and this feels different. I'm only 25 weeks along.