Pregnancy after bithcontrol

TIFFANIIE • 30 single mother of a handsome 12 year old son Im not dating but i would love to have another child by 35. Natural or adoption is OK with me.
I've been on depo for 6 years and off it for 2 my son is 8 and I've been trying to have another with my bf of 7 years. Still no luck. Doctors told me since I was on depo so long my chances where not so likely which hurts bad