For your 1st trimester is every month , then like in the middle of your 2nd trimester you go in every 2wks & then when your 35 you go in weekly.
I've been going every 2 to 3 weeks a month, since I found out I was pregnant. I'm high risk and I see a specialist once a month. But for normal pregnancies it's once a month, around 28 weeks 2x a month, them about 34/35 weeks it's weekly.
I went every 4 weeks until I was 28. I switched doctors because I moved and since I'm considered high risk I'll be going every week until she's born.
To begin with. Then when you reach your 3rd trimester, it goes to 2 a month. Then when you got about 35 weeks, you go in weekly.