HELP! Really bad cramps 2nd trimester

Danielle • Married my best friend on 4/11/2015. I have a son—rainbow baby born 2016, and trying to grow our little family💗💗💗
So I'm about 17 weeks and have been having pretty bad cramps but today they're so bad! Happened after walking around in the mall, they came on really strong, I had to sit down,  I felt really hot and sweaty. This lasted for about 2 minutes every ten minutes for about an hour.
I'm resting w my feet up and still having cramps just not as severe.
What's going on here? Am I alone?