confusing symptoms

so not totally sure if preggers yet but I have a feeling and going for blood tests in a couple of days so for a few weeks now I've had really intense nausea and heartburn pretty much non stop yet for the past day or so I just want to stuff my face with all the food I can find ( I don't actually eat any of it though trying to maintain my willpower) and when I eat my appetite returns momentarily then as soon a I'm done eating the nausea comes back yet I'm still wanting to snack even if I'm full ... anyone else dealing with this?