People who might know symptoms of pregnancy!!

Eme
Since Friday, 3 days ago, I have been having symptoms.  I am going to test in 3 weeks. We have been trying for about 3/4 months!!
Here are my symptoms:
Upset stomach
Nausea ( have thrown up yesterday morning)
Overly tired 
Bloated
Diarrhea and then I cant go then bak to diarrhea 
If I dont eat every 2 hours I feel a little faint but then I get nauseous again :(
I am excited but worry that I might be something else!
 Thanks