OB check up question🤔

Catalina • Baby Anthony 10.06.17 👶🏻💙 Happily married 💍 fur mommy to one 🐺

I'm 29w today and starting next week I have to start seeing my OB every two weeks. Last time I was checked down there was when I was 13w. When do they usually start checking again?? FTM so I don't really know :/