How soon can you start noticing pregnancy symptoms

I was two weeks when I started noticing pregnancy symptoms and tested positive lol but that's a rare case. With my first I started noticing probably around four weeks

This would be my third kid so I just wanted to know how early other people start to notice

3 weeks for me. Tested positive 3 weeks 6 days. 3rd child

I was 4 weeks. faint positive. nausea, lot of peeing and a little bit of sore boobs