My niece is an ob-gynecologist who said that even at the early stage of pregnancy, the woman should observe discipline like a change to a healthy lifestyle. My niece said that mothers would blame other things when the baby is born with a defect but it can sometimes be due to the bad lifestyle of the mother.
That's why it's important to have regular check ups as soon as the woman becomes pregnant so that the baby comes out healthy.
Some changes are normal when pregnant, but some symptoms you will have to pay more attention to when you are at that early stage: a little nausea or bleeding is not unheard of, but you might need to speak with your doctor, just to be on the safe side.