Cramping

Nothing β€’ 20 ✨ Christopher born 7.27.2016 πŸ’™ happy πŸ’—πŸ°πŸ±
I'm 18 weeks + 3 days today. I haven't had any stretching since I haven't gotten a bump yet. I'm starting to get slight cramps in the center(a little above my belly button) on the left side of my stomach. Is this normal? The cramps aren't unbearable and they only last for a a little while. What is this?