1 week late (normal cycle?) negative test?

My period should have started 3/6/08. I have a deviated septum and have no sense of smell until recently & a very consistent weight. The week before my period was due I began feeling extremely tired and my chest was very itchy. On Thurs.3/6/ I woke up expecting my period but just had some CV & a spot of blood. The next day my husband made salad & the smell of the dressing bothered me. I took a preg test but it was neg. so I thought maybe it was bad period symptoms. By Monday I was feeling a little nauseated through out the day & very thirsty. Began having trouble sleeping at night cause felt too warm. By Wed. I went to grocery store & when I went by fish department had to leave cause I thought I would gag from smell of fish, the whole day I felt bombarded by smells. I'm having real bad headaches and pin point burning pain in chest, abdomen & lower back & gained 6lbs in 1 week. Went to OBGYN today & did urine test at 4pm-negative.Still "feel" pregnant. Should I re-test w/ am urine?