Weirdest period

Ss

Ok so for 4 day I just spotted and one day heavy now nothing and normally I am heavy for 7 days

Not only that I am nauseous and tired and just feel so off. I also drink Mt. dew like crazy and now I want nothing to do with it (which is super odd) I don’t know what’s going on with me? I was 12dpo. When I started to spot if that means anything

Has any one had a weird period or there period and ended up being pregnant.