Questions?????

Hi everyone im new to glow and i have a question for you. We had intercourse on all the days i was ovulating about two and a half wks ago.A few days after when i would wipe there was just a little bit of pink. I was due for my period 4 days ago. I took a test and it came back negative. So my question is what could this be..... if i did get pregnant i would only be 2-3 wks is that to soon to tell? And could the pink when i wiped be implantation?