Welcome to the forum and congratulations! You csn definitely find a lot of info and support for your pregnancy here
May I know what is PEH? There are many recommendations for good gynaes in the forum....I think a very popular one is Dr Benjamin Tham. It's important for you to be comfortable with your gynae as you will be seeing him/her for 9 months. Different ppl have different preferences so do have a think about what you want in your gynae. My gynae is Dr Yvonne Chan from TMC and I totally trust her ever since my last pregnancy 5 years ago.
In your first visit, you can find out your EDD. Can also ask gynae the dos and don'ts during your pregnancy. Your gynae will be able to schedule the visits accordingly. Usually for the 1st trimester, you will see them every 2 to 3 weeks. Mummies pls correct me if I'm wrong.
There's no need to scan the baby at every visit but most mummies would prefer to see their growing babies at every visit and to make sure that everything is going well.