Hi I am 19 year old and me and my boyfriend want to try for a baby but I came off the injection in march and had a period for nine days in may I haven't had a period at all this month but I have had the belly cramps as if I was going to come on I have done pregnancies tests but they have all came back negative I was just wondering how long it took people that have been on the injection to fall pregnant I was on the injection for 2 years please help me out