Implanation bleeding or early period?

My partner and I had sex, December 1st. Then we had sex again 13th, and right after I went to the bathroom. When I went to the bathroom and wiped it was red I thought I was on my period because I was very close to my due date. My last period was on November 17th and it usually lasts for 7-8 days.  However it only bled a little when i wiped it did not stain.Then the bleeding stopped for 3 days; there was no bleeding when i wiped. Today is the 17th and I just went to the bathroom and wiped again and it was light pink. Then later that same day when i wiped i don't see any more blood. I just started to get some cramps in my legs and my under abdomen. I am very confused if this is implantation bleeding or that my period is about to start. please help.