19 weeks and having spasms

Cassie • 🎉🎃🍁🍂 blessed with a beautiful 3 year old boy a 2 year girl and a 9 week girl👨‍👩‍👧‍👦
I'm 19 weeks exactly and lately everytime I go to get up or move about my tummy is giving me spasm like feelings either side of my belly button, I could be picking my little one up and I'll have a spasm, I'm trying not to tense my tummy but there's times were it can't be helped, anyone able to tell what it could be please xx