Pregnant?

Hey everyone

So I have been ttc for almost a month. Yesterday I began to feel very faint. I got dizzy and when I stood up my knees buckled and I nearly passed out. This morning the same thing happened. I got really dizzy and couldn’t move and it made me so sick to my stomach that if I had food in my belly I would have thrown up. My husband and a co worker both asked if I was pregnant. I haven’t taken a pregnancy test and to tell you the truth I don’t want to because I just don’t want to see a negative...when should I take a test? Should I? Could I really get pregnant this quickly? I just don’t know what to do...