Implantation bleeding or not?

I am 6 days away from my period and on the 15th I had one spot of light pink blood, nothing after that. Now today I have had light brown spotting once in the morning and now once in the afternoon. My boobs hurt when I am walking up the stairs and my nipples have been tingling. Also have light cramping only on my right side. I just can’t seem to shake the feeling that somethings different.