Nausea or vomiting, more commonly known as morning sickness, can start to happen as early as two weeks after you have conceived your baby.
Morning sickness doesn’t only happen in the morning, it can happen at any time of the day.
Another early sign is getting a strange metallic taste in your mouth, or you may lose interest in certain food that you used to enjoy.
If you find yourself needing to wee more often, especially at night, this could also indicate that you are a few weeks into a pregnancy.
source: express.co.uk