Can diarrhea be a pregnancy symptom?

I have been having a lot of diarrhea even though I haven't been eating a lot. For some reason I haven't had much of an appetite. This has never been a PMS symptom for me before, so I'm wondering if it's a symptom of pregnancy. It's still a little too soon for me to test. I should be able to test by the end of the week. I just curious if anyone has ever had the same problem and wound up being pregnant. I'm trying not to get my hopes up.