Depression is well known to make diabetes control difficult to achieve Nicola:
How can depression affect my diabetes?
Depression can affect a patient's capacity to deal with their diabetes, including
managing blood glucose levels appropriately.
Research has found that people who suffer from both diabetes and depression have poorer metabolic and glycemic control which has, in turn, been found to intensify symptoms of depression.
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Additionally, anti-depressants have been found to have hypoglycaemic effects causing serious problems for self-management.
It has previously been reported that depressed people with diabetes are less likely to adherence to medication and diet regimens and subsequently have a reduction in quality of life and increased health care expenditure.
http://www.diabetes.co.uk/diabetes-and-depression.html
@ohitsnicola, take great satisfaction that your HbA1c is coming down so is heading in the right direction, good luck with the pregnancy and hope all goes well.