Stressed out and confused

I'm 36 weeks pregnant with my third and I have had a scan at 32 weeks due to baby's percentile dropped to 24th from 56th since 20 week ultrasound so I had to have another scan at 34 weeks and baby's percentile was then 12th percent in just two week difference :( I have another scan in five days at 36+4 and if she hasn't grown alot since then they will be inducing me at 37 weeks..

My belly is also measuring just at 32 weeks and I'm 36 weeks, are they missing something? Blood flow and oxygen to baby is excellent, why isn't she growing or me :( has anyone gone through this, I'm scared she will come out with complications because I just have a bad feeling that there missing something on these scans