I wouldn't dream of travelling overseas without travel insurance, pregnant or not. You just never know what's going to happen. For example, my sister was wandering around an old castle in Germany, one of her friends tried to jump on her back as a joke (very stupid I know), sis went down hard on her knee and ended up having to have emergency surgery. She came home four weeks early in a full leg cast. Imagine how much you'd have to pay for the surgery, changing flights, cancelled accom, etc without insurance?!