I've lived and given birth in France.
Just to clarify, when booking an appointment on Doctolib, you can book directly with a gynae. The name and specialism of the Dr is very clearly marked, and you have to select the specialism you want, so it wouldn't be possible to mistakenly book an appointment with a gynaecologist instead of a GP. Plus the specialism is indicated on the sign at the door.
A GP appointment is MUCH quicker and easier to obtain, they can refer you on to the appropriate medical professional if necessary.