I have been feeling nauseous and weak/dizzy for the past two to three days now and am terrifed that I could be pregnant. I had swine flu in October and a two week cold this month that I have just realised could have made my birth control pill inefficient but I have just come off my period (took my first pill again on Monday - today is Thursday). Last time my husband and I had sex was on Monday and surely I couldn't tell already if I was pregnant....? I also have lower back ache....really don't want to be pregnant as I don't want kids but hubby does and no idea what I would do...can I take a test this early? Would it even show up as positive this early?