In instantiating the ImmutableString, the function pointers to the get and length methods actually refer to the String.get and String.length method, by going through the base variable which is an internally stored String object. The use of a function pointer can achieve inheritance of a method from a superclass.
Most women will start to show at some point between weeks 12 and 24 of pregnancy, with most reporting that they began to show during the first half of their second trimester, between 12 and 18 weeks.
Many women experienced signs of being pregnant as early as six days after ovulation day; with the most common sign being tender breasts. Other women noticed signs such as implantation bleeding or fatigue as the first signs of pregnancy. These signs are present in week four of pregnancy.