Im currently 22 +5 weeks pregnant. For a while I have had constant thirst which never goes away. I mentioned it to my GP a few months ago and he said I would need to have a blood test. He didn't inform me I needed to fast for the blood test so I was told that if the results were abnormal I would need to redo the blood test. They didn't tell me what type of blood test I was having but was told the result was normal. I have been putting the thirst down to pregnancy but now it has become much worse. I am drinking 4 litres of water a day and could carry on drinking water but am trying to stop myself. I have have also started to feel quite light headed. I mentioned this to my GP who said I had my bloods taken a while ago and it was normal but what I was drinking was not normal. Should I be concerned? I don't want to seem like I am being a worrier but I am a bit concerned and don't feel I am being taken seriously.