Okay so I'm just wondering if I could be pregnant , I had sex on oct 5 2012 & my period for that month was late / short I took a pregnancy test nov 1 it was negative but for the last 2 weeks I've been having back pains , sleeping a lot , feeling like I'm going to throw up nausea , trouble sleeping at night @ ECT , I want to know if it's to soon to do another pregnancy test my period is normally due on the 21st & it's the 29th it's usually ON TIME but has not came yet any suggestions ? ? ?