My understanding is that it can take a while for fertility to return after the depo shot, but you are at the point where typically it does return. Everyone reacts differently to depo, though. I have heard of people having false negatives on the pregnancy tests for up to two months, but that is not common and there can be a number of other reasons for abnormal periods. I am glad things were OK at the doctor. If you still think there's a chance you are pregnant, then definately act as such. Take prenatal vitamins if you are not already, avoid alcohol and tobacco, etc. I will keep my fingers crossed for good news for you!