Implantation bleeding

Chloe

For the last 2 weeks I have had cramping in the belly. Last week I had very light pink spotting, that only lasted 1-2 days, now today I have got very light pink spotting again, 5 days before my period. Had a headache, feeling sick and really tired, the cramping is still there. My friends think I am pregnant so does my boyfriend. I did a

pregnancy test last week

and it was negative..

What do you guys think?