Could it be the stomach flu?!

I am 33 weeks pregnant and last night about 9pm I just started feeling not quite right... nauseous and body was somewhat aching. I was tossing and turning all night in bed because I just wasn't feeling right.  About 4am I threw up quite a bit and did feel a little better afterwards. I haven't gotten sick since. I decided to call in and stay home to rest and hydrate all day. I haven't really felt too much nausea..just have a headache, my body is achy (mostly just my back and ribs like most pregnant women), and I've had absolutely no appetite today.

Do you think this could be a little stomach bug or just more pregnancy symptoms?