Birth control issue... (Past)

In 2011 I was on the patch (loved it!) I went off it got pregnant and had my daughter in 2012 after having her I went on the mirana and bleed for almost six weeks and had horrible cramps I went to my doctor and they said that it became dislocated from my uterus and wanted to put it back but I refused, my ex and I went a year without on his part before he left me, my ex after him and my current (all long term relationships) have used condoms and the pull out and came inside me, my bf now comes in me more than he pulls out (we've been together almost seven months) neither of us are trying to conceive but I do think I should be pregnant by now, has anyone had a problem with the mirana and concieving? Or anything similar?