Most airlines have strict rules for pregnant travellers, wherein they are not permitted to travel if they are more than 32 weeks pregnant. Air travel may involve risk since the change in pressure may cause damage to the membranes of the uterus. Before embarking on a plane journey, You should take care to dress easily and follow the rules of the airline. It is also better not to take the non-pressurised cabins in the aircraft since a change in pressure is dangerous. AND THE MOST IMPORTLY, YOU SHOULD TELL AIRHOSTESS THAT YOU'RE PREGNANT IN CASE OF ANY EMERGENCY.