Late/Light Periods??

I am sixteen years old and I have been on the pill for 15 months. Recently, my periods have been coming 1-2 days late and are much, much lighter. They only last for about 2-3 days and then I spot for the remainder of the time. I am sexually active, and have been for about 12 months. Being this late is really starting to scare me. Is this normal or could I be pregnant? Also, if it is normal, will my periods eventually stop completely? Any advice is helpful, thank you so much! 

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