drop in bpd measurements😢

Lujain
Very worried. I had an US @ 21+w everything measured fine within 2-3 days of EDD. I had another one @ 25+w AC measured within 2 days, FL measured within 4 days, BDP however, measured 15 days behind which put it around 4%. The tech didn't say anything about that particularly, but said that everything seemed fine. I wont see OB until 2-3 weeks due to national holiday.
Other info: 
Interior placenta, feel less/ weaker movements( still count fine though), baby in 2nd US has turned breech, placenta mature grade II. 
Does any one have any experience with this, or do u think that I should wait for next appt. or go to ER. Plz help, thanks