pregnant on the copper coil

Kim
I need some advice. I've had the copper coil since February. Everything seemed to be going fine, periods in 28
Day cycle and not too harsh. 
I've been paying attention to my CM due to this app and last week for 2 days I had small little bits of blood in my CM. I ignored it and today I feel sick as a dog and keep having stomach cramps right where I usually get period pains, but they don't feel the same.
I'm not due on my period for another week. I'm slightly concerned I may infact be pregnant, after googling the bleeding- suspected to be implantation....help!!