Ruff Sex or Implantation?

waiting4ourblessing

So on the 15th my hubby & I had sex. (It was lightly ruff). The next day (yesterday) when I wiped I had very light (pink) blood, time passed no blood on pantie liner, then I wipe later on & it's light brown. I'm on metformin & Clomid. AF isn't until another week. I'm going to start Clomid again after af.

Now QUESTION: could this be from ruff sex, or implantation?