Lack of weight gain = baby not growing well?

Hi mummies, ftm here who is currently at 26 weeks. I’ve only gained about 5.5kg thus far…..is this a sign that baby isn’t growing well? :( I am feeling rather worried for some reason…..I can feel bb kicking but just can’t seem to get rid of the worry (I get worried if bb kicks less that day….). My next scan will only happen at week 32 I reckon? Wonder if…..I should be worried……..