Messed up thing about birth control

I have been on birth control since I was 17 years old. First pill I was on was orthrotricylcin low which I liked and my periods were always on time. But I got pregnant with my now 8 year old son. Second I was on an IUD which I loved spotted my periods all together for 5 years as I did not want to have another baby with my sons biological father as he in no good. Third I went back on the pill as my fiancé and I were not quite ready to start trying for a baby yet. It has came to my attention and I think ever doctor should tell people that the longer you are on birth control the more it builds up in your system. I am 28 years old now. I have went to the doctor as my periods have not came in two months and now they are running labs regarding my fertility. The longer you stay on birth control ladies the hard time you might have trying to get pregnant in the future. Birth control can cause infertility. Beware and talk to your doctor in grave detail I don’t want anyone else to have to deal with this