Ok, so admittedly the thought was triggered by this story, and its "I was pregnant, I didn't know what I was doing" punchline 
But, more generally, do women do themselves a disservice when they attribute emotional behaviour or episodes of questionable judgement to 'being hormonal'? You hear it all the time in relation to periods, pregnancy, menopause. Does our hormonal milieu really have that much of an effect on our ability to reason and act rationally? I think not, but I fully accept that other people may have different experiences. Or is it just a convenient excuse?
It just makes me uneasy, as it seems to feed into very Victorian male attitudes to women, female hysteria and so on, and paints us as helpless victims of our own bodies. Which I really don't believe is the case.