pattern change?

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this is my first pregnancy. im 32 wks n 2 days..I was wondering if it's normal for the baby's pattern to change in the womb? for a few weeks before, the baby has been very active during the day, now it seems like baby is more active at night (sometimes). I am just confused n dont know if I should call my Dr or my friend's mom (who is a midwife). I just want some advice/suggestions. please help, thanks!