Hello, I Am 19 Years Old Soon To Be 20

Hello, I am 19 years old soon to be 20 and my boyfriend of almost 4 years and I are trying to conceive. We are having trouble getting pregnant due to my absence of a menstrual cycle. When I was younger I didn't get my period when I was supposed to and had to be put on birth control pills in order to get my first period. Since then I have been on and off on birth control pills and said Depo-Provera shot. I stopped getting my Depo shot in April 2015 and I have not been on any method of birth control since. I only had my period twice after discontinuing the shot. The last time I had my period was in the first week of November 2015 and then I spotted the whole entire first week of December 2015. Since then I have not had any type of spotting or bleeding . Of coarse I need to be having a menstrual cycle in order to conceive but I'm just in desperate need and I feel so hopeless because I feel like I'm not be able to have any kids or if I do it'll be in a long time . What can I do to get my period ?
Shouldn't the Depo-Provera be completely flushed out of my body by now ? I just want to have my period already and at least a normal cycle so I can finally have a baby .