I would say that your symptoms do sound very much like a Cushings syndrome problem. At the moment, the current advice is to reach a steroid dose which controls symptoms then at 3 month intervals reduce the dose to one where symptoms are still controlled. This reduces risk of systemic side effects to a minimum.
As a RN, you will be aware that if your doctor does decide that the symptoms are related, or you need to stop for other reasons then you need to be taken off the steroid gradually. Usually by titrating the dose then going onto lower strengths.
In terms of inhaler use during pregnancy then doctors look at a benefit : risk analysis. Is the baby more at risk from poor oxygen supply or the side effects of inhaler therapy? There has been some work done which suggests that natural steroid production in pregnacy means that asthmatics don't actually need a steroid inhaler in pregnancy but theis has to be controlled under supervison.
I have found no evidence that the inhalers interfere with fertility however if you are experiencing some systemic side effects then it is possible that your female hormones may be affected in some way.
The thing to do now is see your doctor and arrange some blood tests to understand whether the problem with fertility is with yourself or your husband. Once that has been identified, and your hormone levels are known then it may be a case that you need something to 'kick start' your cycle into ovulating.
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