Early Symptoms

So I know it's not possible to have actual 'pregnancy' symptoms before implantation (and production of hcg). But let's not forget about the surge of progesterone during fertilization (whilst that body is rapidly expanding a blastocyst) getting it ready for implantation. This sounds crazy, but I am only 3-4 dpo and I am sooooo dizzy and nauseous I feel like I'm on a boat. Could be pregnancy related....could not (hoping for my rainbow). I know there are women out there who have experienced super early symptoms or just 'knew' they were pregnant from the get go. If that's who you are- I want to hear from you!!! What were your earliest symptoms and how early are they? Despite people telling you it was impossible to know that early.