I am so sure I am pregnant but since its only 13 days since I think I conceived I don't have enough hormones to get a positive yet. Took a test 10 days since possible conception but negative 
Symptoms are: bloating, aching stomach and feeling heavy, lower back ache, occasional headache, one day of bleeding and then 4 days of brown discharge (never had anything like it before), tired and generally feeling like I don't want to do anything, tingling in nipples. I just "feel" like I am pregnant. I am waiting till this Friday to take a test but the waiting is driving me crazy! Anyone else experienced this???