Implantation bleeding?

Hi! November 30th had the fun haha December 2nd i started having a lot of cramping and low back pain had some clear stretchy cm was thinking possible O then the cramping and back pain continued. December 5th had the fun 3 times. Symptoms still here but now I have a couple zits and I noticed today I had been crying off and on for the last few days like actually saying to my self get it together what's wrong with you lol

So this evening I went and bought a huge box of pads and tampons at Costco cause im like aunt flow is coming (due for her December 19th) I go to the bathroom and I wipe. I had a slight spotting pink reddish it didn't even get on my unders. Put a pad on and now the cm is clear.... If my period is due in 3 days isn't it to late for implantation bleeding?

I have had 7 pregnancy and 3 live have only had implantation bleeding with my daughter with was the sane in a mount and color

Thanks!