the dredded depo!!!!!

I have heard the horror stories and still decided to go with the depo shot as my first choice as BC since I was 17. I stopped for awhile a few years back then decided to once again go on it. Well the time had finally came when I was ready to add my first child to my family. My last shot was in February and still nothing :( I have heard it could take up to 15 months! Any advise? I just starting tracking my ovulation this week along with this app because I frankly did not think I would be having this problem since I am a healthy 27 year old. Thanks in advance :)