Ecology, Evolution and Genetics. Solutions to many of the world's most pressing environmental issues require a basic understanding of nature at the organismal, population and ecosystems level.
Average. On average, women start to show around the fourth month of pregnancy, between weeks 14 and 17. By week 17 the uterus usually has expanded to just an inch and a half below the navel, making the pregnancy more obvious.
Some women begin to experience pregnancy symptoms as soon as they conceive while the others take few weeks to develop pregnancy symptoms. Experts are of view that pregnancy symptoms begin in 5th to 6th week of fertilisation. Even though some women say that they noticed changes in their body within a week of unprotected sex. Others miss the signs for a 3 or 4 weeks. When the egg is fertilised, it becomes attached to the uterus and starts to produce hCG.