Had my regular monthly appointment today and everything went good. At the end they always schedule…

Had my regular monthly appointment today and everything went good. At the end they always schedule me for my next appointment and it surprised me when the doctor said he would see me in 2 weeks. I thought I would have one more monthly appointment then after that have my appointments every 2 weeks. He said nope it's time for appointments every 2 weeks until the last month then it's every week. I'm 25 weeks 2 days along..isn't that early to start going every 2 weeks?