Implantation or period?

Has anyone ever mistaken implantation for a light light period?

Monday: spotting on & off all day stopped at 9pm

Tuesday: woke up to some blood on my pad about the size of a quarter with light bleeding all day

Wednesday: still bleeding lightly

Thursday (today): spotting on & off

Thoughts? I may just be paranoid since TTC but still curious.

My periods are normally 6-7 days long & very heavy with biggish clots. None this cycle.