If you have never had thrush before and you think you might have it, or if there is no improvement in your symptoms within three days, or if they’ve not disappeared in seven days – please speak to your doctor. Medicines can affect the unborn baby. If you are pregnant or breast feeding or trying for a baby, tell your doctor or midwife before using Canesten® Thrush treatments. Fluconazole should not be taken during pregnancy. If you have informed your doctor or midwife already, follow his or her instructions carefully.