At 3-4dpo I started experiencing extreme thirst and dry mouth.
At 12dpo I had BFN tests and assumed I was out. That evening I had light cramping.
At 13dpo I got a faint BFP
At 14 dpo I had a positive digital test and extreme thirst.
I do not believe my extreme thirst at 3-4 dpo can be blamed on pregnancy as there is no way the HCG hormone was there that early. However, I do believe our bodies know when an egg has been successfully fertilized and is on its journey to implant-- so I think those SUPER early symptoms are other hormonal changes.
Im 7 weeks 1 day today though and still only have thirst, slightly sore nipples, and 1 bout of constipation. I would never assume I was pregnant by how few and mild my symptoms are.