BFP on 6 dpo

Shilo

I took a test totally thinking it would come up negative 6 dpo because I just had a feel . The first day of my last period was Jan 18. 6 dpo is way early for a positive but I have tested everyday since and still positive. I am nauseas, tired very bloated and I am having mild cramping. my missed period would be 2-18. Is there any way I'm more than 4 weeks ?