Hi there! Just to throw my two cents in...I was on and off depo for twelve years - minus a year long break about half-way through when I tried the pill again..(god I am terrible at remembering to take pills!!! And the nausea -ugh!!!) Anyway - I went off Depo in April of 2006, due to my doc in the US suggesting the osteoperosis risk as well, and due to a series of events I didn't start another method of birth control...Fast forward to May 2007 and I got pregnant without any special effort! I'm not an expert by any means, but I believe that if you look at the main ingredients in Depo, they are the same as in the progesterone only "mini-pill"...Also, I think the pregnancy statistics for women coming off the pill and coming off Depo tend to be very similar at one and two years off the birth control method... I have actually started to wonder who funded the Depo-osteoperosis study - was it a BC pill manufacturer? And I would question whether the same study has been performed to prove/disprove a link between any hormonal birth control method (ie the pill) and osteoperosis...
I'd say, do what feels right to you.... Oh and in the osteoperosis risk minimization, my doctor recommended the calcium supplements in conjunction with regular weight-bearing exercise...