11 DPO implantation bleeding???

Being as this is my 4th time around, you would think I would know all this already..lol. Anyway, I have a quick question regarding imlantaion bleeding. I am 11 DPO and I have been having some early pregnancy symptoms. Increase in CM, Tingly sensation, heavy feeling in breasts, my veins are darker in my chest and breasts, nauseous and tired.I have also been having AF type cramps off and on for about 4-5 days now. I don't usually cramp until the day I start my period. I am due to start either June 23 or 24th.I took an FRER HPT @ 10DPO and 11DPO (today) both were negative.

This afternoon I started feeling the AF type cramps again except they were a little bit stronger. I thought it was strange because I am as regular as they come. I never start early by more than a day and I am never later than 14DPO, I also don't start in the middle of the day. I usually start early in the morning.

So, this afternoon when I wiped (sorry TMI)I had brownish tinged CM. There was also a bit of pink on the TP (a very very small amount). I am still cramping, but no more spotting. Could this be implantation bleeding or do you think it is just my AF coming 3-4 days early?

I had implantation bleeding with my first pregnancy, but not with my 2nd and third. Thanks for any help!! The wait is killing me..lol.

Nicole