Is this implantation bleeding or what?

My period is supposed to start September 1st but I’ve been cramping

Also ignore the little fuzzies, they’re from my shower towel🙄😂

My period is supposed to start September 1st but I’ve been cramping pretty bad for a few days, me and my boyfriend had just gotten done having sex and when I went to pee I wiped and seen something that looked like this except it was more light pink. I put a pad on because I thought I was starting my period but this is all that’s happened so far.

I’m so scared because we’re only 19 and 20 years old, I already have a child and we’re really not ready for another one rn. Also I wanna say it was Saturday? I took a plan B but by the time I took it, it was only 85% effective at that point so idk if this could be happening because of that or what. I’m very very scared, and also idk when I should take a pregnancy test because with my first pregnancy I was already 2 months along before I found out.

Also ignore the little fuzzies, they’re from my shower towel🙄😂