Any implantation bleeders out there?

I am somewhere between 10 dpo and 13 dpo and last night i had some slight burning/cramping just above my public bone. My husband and I had and immediately afterwards I had some pink spotting. It wasn't much but enough to scare the mess out of me. I cried! It stopped shortly afterwards but this morning I have noticed a very light brown discharge when I wipe. Oh and my bbs are bothering me this morning too; they are achy. No red blood what so ever or at least yet. I shouldn't start until Sunday so could this be implantation bleeding? Thanks in advance...