Just venting I guess

So I can go up to a year without a period and before now they haven’t done anything about it but now I’ve finally got a Obgyn that has actually helped. My mom had the same cycle like me and when she was about 30 she got ovarian cancer. Well this Obgyn told me my chances are very high because of my cycle and she wants me to come in every 3 months I don’t have a period to get a shot to make me have a period ( if you have got the shot because how was it and did it help?) we are trying for another baby as well since our son is going to be 4 this year and I do plan on getting everything removed after we have another baby. I don’t even know what I’m asking at this point but I guess I’m just nervous and worried after my last appointment.