Confused- Pregnant or not?

I feel very pregnant. Dizziness always occurring. in fact i played hockey 2 nights ago and almost fainted. breast sore and nipples darker. Nauseous every now and then. Over tired especially in the afternoons. i had cramping and light spotting (which i figured was implantation bleeding. It was light and i noticed tissue type substance with it (which i read is common for implantation.) This occurred around 7dpo and lasted 2 days. test at 10dpo and 11dpo had very light lines which looked a bit like evaporation lines. didn't really change colour but the test on 12dpo and 13dpo (today) did not show anything. My period is due tomorrow however yesterday I started having light bleeding it ws light, but today a bit heavier. It is pinkish red. I assumed it ws my period so counted out being pregnant I cant see how it could be implantation because i had bleeding already which ws much lighter so surely this cant be i think it is to heavy tho it doesnt feel like a normal period as i normally have bad cramping and so far nothing. 

Anyway this morning i came to the conclusion that i was not pregnant with the neg HPT and bleeding. However, my sense of smell has become extreamly sensitive over the past 24hours and in the last 2 hours i can smell things i normally would not feel. Plus about 15 minutes ago my lower back really started to ache.

Could I still be pregnant? If so how would you explain the bleeding or am i looking to much into it?

Thanks look forward to some responses.