Depo struggles..

I had my last shot of depo in October of 2017 I was on it for 9 months. I got what I thought was an official first period on February from the 19-24 but haven’t had a period since. I did have some mild brown spotting for barely a day and a half May 22-23. But have had nothing since and no signs of af. My fiancé has mentioned my breast looked a bit bigger and they have been feeling sore lately. But I tested yesterday and thought maybe I could see a line but it was super faint.. Could I possibly have tested to early or maybe I’m just over analyzing since I haven’t had a period in so long?