Depo Provera and Period

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I got the Depo BC shot almost 7 weeks agoz i got my period 3 weeks ago, it started off brownish in color and light and turned a bright red and heavy by the second week. Last week marked 3 weeks since it started, lighter but still red. Yesterday I only spotted once and thought it would be gone but I am spotting again today. Is this normal?! 
*First time ever getting a shot. Pre-pregnancy I was taking Loestrin BC Pills.