Babys Percentile falling behind

I am currently 28 weeks pregnant with my second. My last appointment when I was receiving my ultrasound they noticed the baby was falling further behind in percentile. The baby went from 26th percentile to the 19th. Which didn’t bother me to much since anything above the 10th percentile is ok. Well the baby’s head went from the 8th to the 4th percentile. Has anyone else had something similar and what was the outcomes? Did baby eventually catch up?

Any advice would be appreciated