Malaise? General not feeling well?

Lisa • Little girl born 2/14/13 at 2:14 AM. Missed MC at 15 weeks with Baby #2.
Hi friends! 
I'm currently 9w1d and I have been very tired. I know that this is a symptom of pregnancy, as I also experienced this with my first. However, today, I was woken up early by my three year old, didn't get a nap in and I've just been super tired all day. This has been followed by a headache and an overall sense of malaise-- just not feeling well. Has anyone else experienced this "just not feeling well" thing? Maybe I just need to go to bed early!