on the pill and spotting

Kathleen • Libra. Compassionate. Understanding. Love one another.☯☮
I have been on the pill for 5 years now same pill and I have not experienced spotting before. I always take my pill on time. It started on monday thought it went away this morning but it's still here it's not as heavy from when it first started. But I am starting to get cramps. Could there be a possible chance I could be pregnant ? 
Can someone help me out here who have experienced the same thing or knows what's going on or what I should do? Please and thank you !