Implantation (PLEASE) read..

I know this seems a bit nasty but.. We're all women here. 2days ago my SO ejaculated in me.. I had got over my period 2days before he and I had sex. Now today I just finished using the rest room and I wiped myself and seen this pinkish color appear .. I'm having very light mild back cramps and cramps in my tummy. Could it be possible to get pregnant so soon? & for implantation to start just 2days after I had sex...?