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.
While others can't yet detect your pregnancy, by 5 weeks pregnant you may start feeling pregnant. If you have given birth previously you might notice your abdomen looks slightly larger than usual. This is largely the result of bloating. The uterus doesn't rise out of the pelvis until roughly 14 weeks pregnant but many women start experiencing bloating during early pregnancy. You may find your belly looks more poofy at the end of the day than early in the morning. Some women mistake this early pregnancy sign as a premenstrual sign.