Aloo

Hi All,
I'm alittle confused about this, maybe someone can help me out, or maybe someone has gone through this. I tested on 12dpo and got a BFN, then on 13 dpo i got some bright red/pink spotting when i wiped and then on day 14 i got alittle red/brown spotting when i wiped and today is day 15 and there is nothing, may be just very very little. I thought this might be Implantation....even though i know it only happens from day 7-10, but i thought since my cycle is late maybe this is late too, so i tested again today morning and again got a BFN. I feel sick...almost feeling like throwing up and for the last 3-4 days have been very tired. I'm so confused with what is happening. Can anyone shed some light for me?
Thanks
Aloo