When do you visit the Gynae once you know you are pregnant ?

I went few days right after my 2 positive sign on the kit. The whole gynae visit was a roller-coaster ride for me and my husband. The first trip was on 20th of May, the doc couldn't detect the sac thru ultrasound and did a transvaginal scan. So he was sure the black tiny doc was a sac anot. So he told me he suspect is a chemical pregnancy. Then he got me to take blood test and called me 1 or 2 hours late. He told me my hcg was 999. So he asked me to return on 22nd of May, 830am to see if my hcg got increase anot. So I took blood test first and waited till 11.15am. My hcg level increased to 1369 but that wasnt a double and the doc still wasn't sure the tiny black dot if is a sac. So he told me 2 possibilities which is either a chemical pregnancy or ectopic so he got me to for a bigger ultrasound machine around 12pm and we waited till 2.30pm and the report stated a 0.3cm gastation sac at approximately week 5 which rule out the ectopic pregnancy. Next Saturday I'm asked to see him again. My thinking is sometimes we too early to go and see gynae won't have much result. Heard that from 6 weeks onwards is the best.