When you are pregnant you have to take extra care of yourself. This is an exciting time and you look forward to the time when you can hold your baby in your arms. But this is also the time when sometimes unforeseen complications can make life difficult. The third trimester is a particularly crucial time in the course of your pregnancy. As your delivery date approaches it becomes imperative that you take proper care of yourself and be alert to any signs of complications. The third trimester starts with the 28th week of pregnancy and it continues till your delivery.