I don't think it is an overactive imagination, or that you are going mad. Not at all!
I think you are ready, particularly if you are not upset by any of these experiences, to welcome a new little soul.
And certainly, to be aware of such potent noises and smells would be a wonderful indiction that you are truly able to visualise and manifest what you want and need. And the law of attraction relies upon such awareness to create life........
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