Using the pill to regulate cycle?

Blair
So about three years ago I got the depo shot as birth control. About six minutes after that shot has worn off me and my fiancé started trying to conceive. So far it has been two years and six months with no success. I was talking to my best friend, and she said the same thing happened to her. She said her doctor put her on the pill and then after about three months she got off the pill and  successfully conceived her second child. I want to know if anybody else who has used depo has tried this and if it is a valid method of "regulating" your cycle? 
Feel free to give me advice even if you hadn't tried this. Thanks 😇