If you are pregnant can you lose your baby during the first 4 weeks?

Certainly. You barely know you are pregnant at four weeks. Four weeks is the week that you would miss your expected period. Women can lose their baby even at four months. It is necessary that you take all proper precautions to prevent a miscarriage/still birth. Even though you can take all these precautions it does not mean that natural things such as genetics can affect the health of your pregnancy.