Fimbriae (common pili) and flagella on the surface of bacterial cells. Left: dividing Shigella enclosed in fimbriae. The structures are probably involved in the bacterium's ability to adhere to the intestinal surface. Right: dividing pair of Salmonella displaying both its peritrichous flagella and its fimbriae.
Relaxin's peak is reached during the 14 weeks of the first trimester and at delivery. It is known to mediate the hemodynamic changes that occur during pregnancy, such as increased cardiac output, increased renal blood flow, and increased arterial compliance.
Take blood to determine if your Pomeranian is pregnant. About 20 to 30 days into the pregnancy, a dog will start to produce the hormone relaxin. Blood tests can be performed to check for this substance. If relaxin is detected in the test, your Pomeranian is indeed expecting and is about halfway through the pregnancy.