Why is my body being weird???? (Ladie problems)?

So basically I had my period twice last month (really heavy), and then when my regular period was suppose to come (which was like 10 days ago) it was like really really light. Like i had the usual cramping and stuff but not much blood. And now all of a sudden I am cramping really bad like Im about to start my period again. Is this normal?? I am 17. Had my period since I was 9. It is pretty regualr, also consider that I am on birth control (the pill) been on it for 2 years, so my body should be use to it. Anyone know whats going on??
 
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