There are many reasons for cloudy urine.
It could be noticed after eating a large meal or after drinking a milk due to excess phosphate crystals, that is totally harmless.
Normal vaginal secretions that is most prominent near the ovulation time can cause a cloudy urine.
Vaginal secretions due to STD's is another reason.
If you suffer from high blood pressure, you may have increased proteins level in your urine, resulting in a cloudy urine.
The sweet smell of urine is due to ketones in urine, which form when someone is having diabetes or is on a diet.