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.
This has to occur in order for you to get pregnant. You are technically fertile starting 5 days before ovulation and 2 days after ovulation because sperm can live in your body for up to 5 days and the egg lives for 2 days after it is released. Jill P Â· 6 years ago.