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.
It started when I was about fourteen weeks and has only gotten worse I talked to my doctor and its normal something to do with our hormones being relaxed because of the pregnancy and ligaments being relaxed. Also the baby like mine could be more in the back instead of more up front and pushing on all the wrong spots.