TTC Newbie

Okay so I’ve recently just got off the depo shot a couple of months ago which means i only had like 2 shots but I haven’t had a cycle. I’ve only spotted for like a month but now there’s nothing at all . I tested a week ago and I might’ve had a faint line unless i was looking too hard but i tested today & it was negative . PLEASE Help me figure out how to get my cycle nack or become fertile .