I got a call from my doctors office saying that I need to go see a specialist for another sonogram…

I got a call from my doctors office saying that I need to go see a specialist for another sonogram bc the doctors were discussing my placenta and they want to make sure they schedule the c section for the correct date. I asked when did they request it for originally and she said 5/23 that's at 39 weeks so I'm thinking they may be thinking of sooner. I also asked if anything was wrong and she said no I just need another sonogram but the girl I talked to was just the receptionist so now I'm concerned. They are supposed to call me when they have an appointment date and time. Has anyone else had this happen? I have placenta previa and she said they need to verify the placement of placenta to make sure they schedule the correct date?