What your feeling it totally normal.Its also normal to worry! Have faith, see your doctor when you should and take good care of yourself. Sit back and enjoy. Becoming a mother is a wonderful experience!
It is absolutely O.K. The baby is just 5 weeks all that feeling will start from 12th week and will be till 40 weeks. Follow your doctors instructions take regular medicines, go for regular checkups, eat more be always happy. Be a proud mother. Best of luck and good health.