Hi mommies a little help

Hi so tonight I was eating and all the sudden I was having little muscle spasms I swear in my upper ab.is this normal because now it's still happening off and on. I'm 12 weeks 2 days. We heard the baby yesterday it's heart beat was 160 and was told welcome to your second trimester. I doubt anything is wrong just wondering about the muscle spasm feelings in my upper ab and mid belly