12 days post op

My surgeon and dietician never told me how much calories I'm to have each day other than three meals and was told to start purée when I came out of hospital (I was in hospital for 5 days) my question is one night I could have 5 spoons of purée chicken and vege in 30mins and took almost an hour to drink an up and go but next moring I could drink a whole up and go which is 250ml in 15-20mins no problem I find I can hold more round 200-300ml in 30mins is this normal??? Is their an amount my stomach is only allowed to hold?? I don't Wana stretch my stomach and I have hardly moved my bowls only once in 2weeks and I'm taking lac-dol and adding fibre to my drinks should I see my doc? As I don't see my surgeon until Thursday??