What Are The Early Signs And Symptoms Of Pregnancy?

Hi i've been having these weird symptoms and im wondering if they could mean im pregnant? For the past about two weeks i've had really no appetite. I will eat small things then feel so full and sick like i'm about to throw up. I've been very dizzy on and off and have a headache every day. Sometimes i gfet this weird metallic taste in my mouth. Before i was constantly eating then all of a sudden no appetite. My period was suppose to come today but hasn't and my lower back has been hurting and my breats are a little sore, and kinda hard when i feel them. Well, slightly hard but just feel different. Its hard to eat things but something I can really eat without getting too sick is tortilla chips. They dont upset my stomach as much. I've been bloated also. WHen would be a good time to test? ANd do you think I could be pregnant? I did have unprotected sex a few times last month and this month were my fiance pulled out. Its just driving me crazy feelings like this all the time I want to know what going on with me. Can you help me?