I'm not a Mum, but it saddens me to see the old tired answers trotted out again, these were extensively discussed in the West 30 years ago but still people trot out their own prejudiced answers. At 4 Months your baby is a tiny embryo, in a sack of fluid not much bigger than a lemon. we have evolved over millions of years (sorry Creationists!) to function while natural processes happen, and a child in this environment is very securely protected. Imagine what would have happened if every pregnant mum stayed in bed while sabre tooth tigers were attacking the cave! Women have always carried out normal functions while pregnant, they have had to in order for us to survive. There is very little risk to your baby in you learning to drive, unless someone ploughs into you at high speed (always a danger in Doha) there is very little risk in carrying on with most day to day life activities. If you want total security stay in bed for nine months but the bad effects on your health would not help your baby at all.