Inconsistent movement. Help!

Is it normal to still feel inconsistent movement at 27, almost 28 weeks?

On Monday I felt her almost all day, super strong kicks and rolling.

Yesterday I had a really busy day and was on my feet or walking around most of it. I felt her a little bit in the morning and then a little bit in the evening, but not nearly as much as the day before.

Today I barely felt her in the morning. Just a few faint kicks when I had my coffee and then a couple thuds and small rolls during breakfast.

Is this still normal at this point? Or should I be feeling her more and should bring it up to my OB at my appointment tomorrow?

Should I worry?