Pregnancy Symptoms

What is the earliest one has had pregnancy symptoms? Like what cycle day or how many dpo? And what symptoms?

I’m probably just tripping myself out but I believe I’m 4dpo and I’m sooo nauseous and boobs hurt. Been having little bit of cramps since Ovulation. I’m sure it’s probably not possible to have symptoms this early before implantation. This TWW is killing me 🤣