In 9 days we will do an ultrasound of Maggie, and we will know if we will have puppies this summer or not. So far we can’t tell anything just by looking at her, but she is very lazy and tired. On the other hand, she is always like this after her heat, so we will just need to cross our fingers and let nature take it’s course. In the meantime you can look at this very informative pregnancy calender to see how the fetuses are devoping in the womb. If Maggie is pregnant, she is 16 days pregnant today, and around this time the embryos attach to the uterus wall. The size of the embryos are approximately 1 mm, and in a couple of days the embryo will begin to form head and body, spine and central nervous system. The foundation is also laid for development of internal organs. In about a week the placenta will develop, and will provide oxygen and nutrients to the fetus and take away waste to be excreted by the mother.