Advice please!

Jess

My son (he is 18 months) has had an upset tummy for around a week on and off which i thought was just a bug or viral something. He has now started with really strong, kind of sweet smelling urine which now has me a little concerned... he is well in himself though and eating fine. its the weekend so cant get in at doctors and dont want him to be in hospital if its not needed. What would you all do?