Princess Charlotte has only been seen officially in public twice. Princess Charlotte has made her first public appearance on the balcony at Buckingham Palace. At 13 months old, Charlotte is almost the same age as the Queen was when she first appeared on Buckingham Palace's balcony 89 years ago.
For most women, morning sickness starts about the sixth week of pregnancy, which is about three weeks after conception, assuming you have a normal menstrual cycle. It can start as early as the fourth week, which is right around when you might get your period.
I have also experienced nausea and vomiting about 11-12 days after conception (a few days before I noticed a missed period). I believe women can experience symptoms of pregnancy soon after conception based on both the documented timing of hormonal changes during early pregnancy and my own personal experience.