HI,

to be honest I can't remember what happened last time, but I'm sure I only had to be 1 month or 6 weeks. They did an initial meet & great, sign you up for baby school basically, then I think I went back monthly until 12 weeks, then fortnightly for the second trimester & then weekly in the last one?? but I honestly can't remember. I do remember the first appointment they didn't get a heart beat so that would have to be around the 4-6 weeks mark.

If finances allow you can get a referral to an ob.

But where I am it's strange in the public system to have scans until you are 22 weeks, unless of age, or health concerns.
Midwives just check where the baby is sitting, and check for a heart beat, ask you about general health & well being, and update you on the next stage.