Appointment confusion So I have my 24 week appointment tomorrow and I am seeing the physician…

Appointment confusion

So I have my 24 week appointment tomorrow and I am seeing the physician assistant instead of my OB who I have seen every time except the very first appointment before I chose my OB. Anyone know if this is normal or why I'm not seeing my OB this time? Also if this is just a normal appointment like my rest? Any answers would be great, I'm just confused ?‍♀️