The kidney is not one large filter. Each kidney is made up of about a million filtering units called nephrons. Each nephron filters a small amount of blood. The nephron includes a filter, called the glomerulus, and a tubule. The nephrons work through a two-step process.
Generally speaking, first babies tend to engage from about 34 weeks to 36 weeks. However, some babies only engage once labour starts. Try not to worry, though. Even if your baby hasn't engaged by the time labour starts, in most cases, it's not a problem.
You are likely to get your next period four to six weeks after the miscarriage. This period may be heavier than usual. It is possible to become pregnant before your period is due, so if you havenât had your period after six weeks, and if you have been intimate, it might be a good idea to do a pregnancy test.