implantation bleeding??

💃🏻
I've been having very light pink spotting since last night and cramping that started out severe, but is now mild. My period wasn't due to start for about another week and is never this light or this color. 
Google is telling me implation bleeding. What do you guys think? 
I'm on birth control (progestin only pill). I'm hoping I'm not pregnant, what are the chances this is just a light period caused by birth control (I've been on it for about 7 months now and my periods have gotten a little bit lighter but not this much)... should I just accept this as my period, wait a while or go get a test?? I'm starting to get a little bit worried.