Quick question...

So, my periods due in 2 days, but I’m bleeding( wouldn’t even say bleeding, but it’s a little heavier then spotting) this light pink color, usually on the first day of my period I have HORRIBLE cramps, and my flow is heavy, but today I had slight cramps that were bearable, and a light flow with this brown and pink color. I had sex a little over a month ago, 12 days ago and also 3 days ago all unprotected, and I am not currently on any type of birth control, we are using the pullout method though I’m aware it’s not 100% effective. I was wondering do y’all think it could be implantation bleeding or...? Y’alls thoughts please. I also found this online;