Rapidly dividing cells are grouped according to their future purpose, for example, to form baby’s organs or his skeleton. By week five, the brain is developing and the neural tube fuses. Taking folic acid supplements before conception as well as now will help reduce the risk of defects.
The surge of pregnancy hormones may start to kick in, which could result in your breasts feeling tender or your sense of smell becoming more acute. You may also start to experience waves of nausea, along with sudden tears, and even tantrums, as you become more emotional.