Worried and anxious about depo

Hello, just wondering how long it has taken people to fall preg after the depo injection? I was on the depo for almost 3 years and came off of it in December 2014, and went on the pill in order to get my period back on track after not having one for a long time on depo, and I came off the pill after my wedding last year Aug 2015 and still haven't fallen preg and it's really getting to me now and I'm worried ... And reassurance and advice please xx