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.
Second, you may ovulate before your period is over or within a few days after the bleeding stops. Since sperm can hang out in your body for up to 3 days, having sex during your period could lead to conception. The bottom line: Use a condom to prevent an unplanned pregnancy, no matter what time of the month it is.