Period 10 days early?

Hayley
Hey guys! Help!
I had old blood for the past couple days. Woke up this morning with pretty heavy bleeding red blood. Been heavy off/on all day. Slight cramping/off feeling. Getting over a cold so I'm not completely sure how I'm feeling honestly. Lol.
I have the Paragard IUD. 
Not stressed, no major Illness that I'm aware of, 26 so I'm over puberty. 
My period has always fluctuated a bit but never this much! 
Do you think I should call my doctor? 
Think it could be implantation bleeding? 

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