Measuring smaller as baby drops

Avionna Marie`s mommy👣 💜👣 • livin that mommy and wife life! hubby and I have three babies. one son and two girls. expecting our third baby girl August 14th.
I'm 33.4 weeks measuring 32.5 at my Wed appt. I'm wondering if that's normal? I'm a fourth time mom but never paid attention or noticed it before.