Muscle spasms in upper stomach under ribs

Zo

I am almost 20 weeks... I have my 20wk ultrasound on Friday. Starting today I noticed constant muscle spasms in upper stomach under ribs. I almost thought it was the baby but it’s too high to be the baby, especially this early. They are not painful but I was just curious if anyone else has experienced this or if it’s anything I should be concerned about.