Implantation bleeding or light period??

Hi, so i have extremely irregular cycles generally they are 6 months apart. So i cant really take note of them. I had a normal period in Nov and just this month on the 23rd i had very light bleeding only when i wiped. I kept an eye out for the next couple of days and still nothing heavy enough for a tampon or a panty liner. It has varied in colour light pink, brownish and bright red. Today it is very very light and i checked my cm today and there was only a small amount there. It has been 7 days so im so confused.