With my first I had one random incidence of dizziness. Went home and tested that night and got a bfp at like 9 or 10 dpo. In hindsight I really have no clue if that was pregnancy related, but that's what made me test.
With my 2nd I had no indicators that I was pregnant, in fact I wasn't sure when I had ovulated because we conceived on vacation and I wasn't temping or using opks. I just randomly tested the night before father's day 'just in case' and it was positive. Again, it was early, I'm guessing somewhere around 10 dpo.
Most symptoms and morning sickness didn't kick in with either pregnancy until 5-6 weeks.