Cover stories

So, in the past week or two I've had to turn down quite a few social invitations. Between the bouts of dizziness/queasiness and the unpredictable sleepiness, I just don't feel much like going out, and probably wouldn't be great company anyway. It doesn't actually bother me -- I'm pretty introverted and often don't really enjoy late nights out anyway (Dublin city centre on a Friday night will do that to a person). But generally, I need to give people a reason why I'm not going to their party/barbecue/box social/drinks with the gang/other form of shindig. I can't tell the truth, but I don't like lying unneccessarily either. So far, I've come up with the following half-truths:

I'm not feeling too well. (Ranges from not strictly true to oh so very true. But if I overuse it, people will think I'm either dying or... pregnant.)
I have a family thing on. (Pregnancy is the ultimate family thing!)
I'm babysitting. (Well, I'm taking care of a baby, right? And this one's really well-behaved!)
I'm working on a big crafting project. (It's going to take ages, and you're not allowed look till it's done.) (Ok, I haven't actually used this excuse. Yet.)

So, anyone else have any good cover stories?

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Nothing much new in the way of pregnancy symptoms -- although I did start crying at a camera ad on TV, so I suspect I may be getting more hormonal. Another good sign! If deeply embarrassing.