Has anyone been told their baby has a irregular heart beat?

Constance • Updated: my daughter is now almost 7 months old and I'm no longer a single mother. Me and her father got back together
I'm 32 weeks and a high risk pregnancy from having high blood pressure and low thyroid. Yesterday I was hooked up to a fetal monitor and found out her heart was beating irregular. Went for a ultra sound today and from what he can tell heart is fine just double beats then pauses trying to regular itself. Has anyone's baby had this before? He told me not to worry but it's very hard not to.