Hi sarah and welcome. According tot he manufacturers there isn't a difference. They say that even after 1 shot it could take anywhere from 3 months to 3-5 years before becoming pregnant. However most MD's will tell you the averafe is 6mo to a year.
Yes there is info out there! However the only thing you can do at this point is wait! There are some herbal supplements like Vitex (aka chastberry tree extract) that many women take to help get them back on the road to fertility and health but as to when AF and or fertility will return is a crap shoot! You could get pregnant tomorrow or 5 years from now.
There are stick posts that help map out the wonderful world of temp charting and the herbal supplements that one can use and try. Charting is helpful so you can learn your body and to see if you are infact getting over depo or even ovulating.
Charting is where I tell everyone to start from because we as a support group can help one another more easily by having some sort of visual idea of what your body is doing and how it is coming off depo provera as well.
I am tired and can't think straight but I have more to post later.
any ways