For the roller coaster, see Sewer Rat (roller coaster) . The brown rat, also referred to as common rat, street rat, sewer rat, Hanover rat, Norway rat, brown Norway rat, Norwegian rat, or wharf rat (Rattus norvegicus) is one of the best known and most common rats.he brown rat is the species common in England, and best known throughout the world.
1 Yes,you can get pregnant after ovulation. 2  There is a 25% chance of getting pregnant during ovulation,and a 5% chance when not ovulating. 3  The egg does not survive for more than 24 hours after ovulation unless conception has occurred.
It's possible to get the feeling that you're pregnant soon after you've conceived. So you may experience early pregnancy symptoms just two weeks after conception. However, at this stage, your doctor will say that you're four weeks pregnant. She'll count your pregnancy from the first day of your last period, because there's no way of knowing for sure the exact day that you conceived.