Vaginal delivery after c-section, is it safety?

Goldy
Happy New Year, ladies! I am currently 12 weeks pregnant. I have a 16 months old daughter, delivered by c - section, due to breech position. According to my doctor there is nothing to worry about if I want to make it vaginal this time (what I would like to). But last week I incidentally met another doctor and he said that I have to schedule a second c - section since I have one done. There is a risk the scar to open due to pushes. Please girls share how many of you delivered vaginal after c- section. How long between? Every answer will be appreciate. Thank you