By the fifth week, your child's brain, spinal cord, nerves, and backbone, as well as all his organs have formed and are already functioning.
You won’t be able to see all that he’s been up too, but you’ll definitely feel the early signs of pregnancy like sore breasts, fatigue, and frequent urination, followed by nausea in the coming weeks. But not to worry, nausea and vomiting are temporary and harmless.
This is also a good time to start or continue an exercise routine to develop the strength and endurance you'll need to manage the extra weight you'll be carrying. You can try walking, swimming, yoga or pilates, but you’ll have to postpone rock-climbing for much later, preferably after your little angel is a year old.