Confused about my period can somebody please explain

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After depo I only had like 6 or 7 period I heard that for some women they have heavy periods after dropping it because before I never had heavy periods but my cramps was out of this world sometimes I’ll have to go to the doctors but that’s when I was a lot younger around 12 I’m going on 18 now but my queries what is a sign in heavy period my periods are only heavy the first two maybe three days then there medium for the 4th then light the 5th day then spotting for 2, so I’ll say I have a 5 day cycle cause it’s just old blood so I believe that’s not my period or is that a whole 7 days i don’t knowing so confused like I been having period since I was 9, got a depo and forgot all about how they are how they work.also if you don’t get what my question is, it’s have you had heavy period after stopping depo and how long did it go on if so? Should I speak to my doctor about it? Or is that normal? Also does it sound like mines are heavy? I spoke to my mom and doctors about Ttc and I never thought that I had a heavy period till today, so I feel maybe that’s why. Aldo I take ovulation test the test get darker but I don’t know.SOMEBODY PLEASE HELP!!!