Period or implantation?

I got my iud taken out in September and had my first period October 2nd-7th I started tracking my ovulation a week after my period ended because I wasn’t sure how short/long my cycles were. I never seemed to get a positive result so I figured my cycles were all messed up due to my iud getting taken out not too long ago. Today I had this light pink spotting but this is the day I should’ve had my period. I never had spotting with my first baby so I’m not sure if this is it or if it’s just a super light period? Any help would be appreciated! Thanks