Depo question

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Hi guys, my partner and I started trying for a baby in April last year and nothing was happening and we got upset about it (I understand people try for years) in the heat of the moment we decided that now wasn’t the time for us and I had 1 depo injection in December. I had an awful allergic reaction to this and so haven’t had one since and me and my partner have agreed to say off birth control and if it happens then lucky us!! Does anyone know if after one depo shot how long it will likely be until I’ll be fertile again? I have so many questions and regrets