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.
Your menstrual cycle can give you clues about when your body is ready to start the process. The first step is to learn the days when youâre most fertile. Most women have a 28-day menstrual cycle. That means you have about 6 days each month when you can get pregnant. That includes the day one of your ovaries releases an egg, called ovulation, and the 5 days before. Having sex within that window is key. To figure it out, youâll need to chart your menstrual cycle and record how long it lasts.