SIGNS/SYMPTOMS OF PRENATAL DEPRESSION...?

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I was just wondering if anyone is familiar with prenatal depression symptoms and causes?

I know I may just be paranoid, but I have just been feeling low and unmotivated (almost like I can't concentrate and I'm bored) for the past couple of weeks... can't seem to sleep and eventually do at about 7am (after kids & hubby r out of the house for skool & work) - thank God I work from home or I would have been fired - so I only then manage to get out of bed at about 11am (even then I'm not quite ready to get up but have to tell myself 'the day is gone' etc)... also for some reason for the past 2weeks i have been getting up to change my pjs as they r drenched in sweat (this happens at about 4am, regardless of whether I am asleep or not)!! Do I see the doc about this or ? Does any of this make sense at all?

It's a bit of a challenge trying to stay positive, so would really appreciate some sort of feedback.