possible implantation?

I'm on cycle day 18, already passed my fertile window, dh and I bd ALOT this month. period isn't due for 12 more days so I don't know if it's way too early for implantation?? the first time I got pregnant we conceived the day after my period ended. this month I had ewcm on the 24th and 28th but I've had heavy wet cm for the past week. I did not take any opks this month as I'm trying to relax more with the process so I don't know when I ovulated. I noticed a slight color to my cm when I wiped today but am not sure if it's implantation or if I'm just crazy. it has a pinkish tint to it