I just started the depo shot and my first period on it was late by a week. During my period my flow was really heavy and light off and on for 8 days. After I thought I was done I started getting dark brown blood and watery discharge that come out in small amounts or huge for almost 9 days now. I've read on several websites it could be breakthrough bleeding and that it could last 2-4 days or up to 2 weeks. I'm confused I need some advice.