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.
Yes, it's too early. No woman starts having pregnancy symptoms two days after unprotected sex. If you conceived, plenty is going on in your body, but on such a small scale that you will not notice it. You don't start having pregnancy symptoms until that egg implants in your uterus. Plenty of women start having symptoms of something other than pregnancy two days after unprotected sex or even right away though, symptoms of WORRY and STRESS. Feeling sick to your stomach and a loss of appetite are both anxiety symptoms.