You're in Australia yeah?

My experience has taught me this:-

First step is to see your gp. They will refer you to the hospital. You may be zoned for a certain hosp but if you have a preference you can ask to be refered to a different one. Whether they accept you or not depends on the hospital.

There are a few different models of care.
I dont know much but my understanding is this-
Gp shared care - your appointments are 1 on 1, spread between hosp (midwife mostly and at least 1 ob) and your gp, you will likely get a different midwife at each appointment. I stayed in 3 days after the birth of my son. No follow up after that. Was sent to the mchn and gp for any care after that. This was 5 years ago. It may have changed.

Midwifery led - you see the midwives at the hospital and only one or two visits with an ob, 1 on 1 again, different midwives each time.

Or at my hosp (mater mothers public) they also had a Midwifery Group Program - a group of 10 ish women under the care of a team of 4 midwives who see you for all appointments in a group setting. You are assigned 1 midwife from the team and the others are the backup anytime yours is off work for any reason.
I also saw an OB at around 16weeks at the hosp but that was the only hosp appointment I had.
Unless there are complications or you wish to stay for a paritcular reason they discharge you 4-6hrs after birth and follow up with you at home for the first 6 weeks post partum.
**This is for low risk only I think


Im not sure about the high risk stuff or BMI as it wasnt an issue for me.

Your gp will also calculate your EDD or send you for a dating scan if you arent sure of your dates. They will probably send you for a blood test to check your levels (iron, vit d, etc) and your immunity to certain illneses.
If you are stressed about miscarrying again you can ask for a scan to make sure everything is ok.

Before you see your gp, look up your prefered hospitals website. They should give information of the different types of care they offer so you can make an informed choice.

If I think of anything else Ill come back.