no period on birthcontrol shot??

Jaelyn
I am on the birthcontrol shot. I have been since September of 2016. Is it normal to have light bleeding but it's not really thick blood? It's light red and very thin. It only happens once a day every 3 months. I don't have a period anymore. I'm only 16 and ive had sex 3 times but you can't get pregnant on the shot can you? I've took a pregnancy test in the past and it was always negative. Help please! 

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