How early can you catch on that you're pregnant? What are are signs and symptoms to look out for? Whats the earliest sign to notice?

A week after my last period, I started craving for Soursop milk shake and started hating white rice 😂 I experienced vomitting, diarrhea and dizzyness every single day. took me 5 weeks to ask my hubby to buy a pregnancy kit and later went to an OB-Gyne to confirm haha!