From the sound of it, it seems too soon for you to know already, but then again, I'm not a girl so I don't know the intricacies of the process that goes into it. I heard women don't loose there appetites do much as gain cravings for weird foods or foods they normally wouldn't eat (I heard Pickles and tuna Fish cravings are pretty typical for this.).
All in all I would recommend you get yourself checked out. go to a doctor or get a pregnancy test.
For something this serious and life changing, asking online if you are pregnant is probably not a good idea. Not because we can't help, but because we aren't all doctors. On top of that, We don't have the ability to actually look you over and tell you "Well we looked here and you are/aren't Pregnant.".