How long does it take for periods return after coming off of the pill?

I came off the Yasmin contraceptive pill six weeks ago as my bf and I have decided to start trying for a baby. Having been on the pill for 10 years I understand it may take a bit of time for my body to adjust. I haven't had a period yet (apart from when I first came off of the pill) and I am not pregnant as have done two tests. I just wondered how long it will be till I have a period? I am also worried I wont be able to concieve or am producing eggs due to having endometriosis last year. I am also worried it may have returned and not taking the pill will make things worse.