Could it be implantation spotting?

Sonia
For the last 3 days I've seen spotting in my pantiliners. The first day only once but was a brownish color, yesterday the same but very little and more pinkish, to day was only a little but it was really red. My AF is due Thursday Oct. 9 I'm always regular. Any thoughts? I'm afraid to test and get a BPN. ??? Help!!!