Trying to get prego after more than 5 yrs on depo shot. Any advice??

Im 33 proud mother of 3 and would like to have my last baby i didnt have a problem before triyng to conceive however this time I spend more time on the depo shot almost 6 yrs nd already had 3 miscarriages in 3 yrs I fill terrible I thank god for the kids that i have I fell more prepare than ever before nd I cant describe my felings at this time that I cant get prego all i get from doctors is your ok it happens I dont drink dont smoke, does any one had suggestion for me, did this happens to any one Im scare I hear that some girls got steril for using the depo shot for long time please help!!!