I think the only way a flu could impact pregnancy is that you need to keep your temperature down, as a very high temp can cause issues with the fetus in the first trimester. This doesn't apply to mild temperatures, only extreme ones, so don't panic too much.
Like Dee said, the main inconvenience is not being able to take a lot of the common medications that make colds and flus more bearable! Panadol is ok, but only take what you need. Apart from that, grin and bear it, and drink lots of fluids!

I hope you feel better soon,

Kerrie