Baby dropped percentiles

Grace 🦋 pcos 🌻 👧🏻👧🏼👼🏼

I just had my recheck ultrasound so the could get the views they wanted of her heart and feet . That came back good but then she told us the baby dropped from being in the 30th percentile 4 weeks ago to now the 6th percentile . I’m 27 weeks . My doctor again said she wasn’t concerned as of now so I’m trying to not work myself up here . But she’s sending me to get an ultrasound in a different department where they have better machines , I forgot the name they said . She told me if the baby continues this that I’ll have to give birth sooner then 40 weeks and they will be monitoring her more . They want to make sure it wasn’t just a machine error or the babies potion they caused it. Strange part is her head is still measuring in the 30th percentile. I’m trying to not go on and look at stuff in google because that will just scare me more . Just seems like a really big drop .