when to visit gynae

I had a miscarriage last year Oct.. pregnant again few months later now going week 30...from my experience there is nothing that the doc can do to prevent a miscarriage.. therefore this time round I went to see a gynae in week 8 because I am not sure how long do I need to wait to get an appointment at kkh. the first time I went to a private and felt that it is too costly. but since it's week 8 when I go kkh I can't do the first trimester testing and blood test as it is too early.. therefore, it would be better if the first visit I can do a scan and do the first trimester testing as well. because during the first trimester there is really nothing that we can do to prevent except to eat healthier, avoid strenuous workouts and eating folic acid.