How many Antenatal visits does a pregnant lady need?

"When the patient comes to us with pregnancy test positive, usually I would like to see her in the first trimester for every monthly and then beyond from 13 weeks to 28 weeks, monthly checkups are advised. Beyond 28 weeks to 36 it is always fortnightly, that is every 15 days, again depending on if she is a high risk patient or not and depending on that the visits also vary according to that and beyond 36 weeks, every weekly checkups are suggested to them"