Is it normal for amniotic fluid levels to go down?

So just wondering if it’s normal for amniotic fluid levels to go down?

At 27w+4 it was 3.7cm

At 30w it was 3.2cm

At 33w it was 3.0 cm

And today at 34w it’s 2.9cm

Is it normal to reduce? I do feel like it’s been a bit moist but I’m not sure if that was due to the yeast infection I had.. which has now been treated.

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