hello to all

Im michelle 23 and married...i would like to ask if the following signs are saying that i really pregnant...
here are the following signs i experience this previous month... i supposed to have my period every 10th of the month... but this month august 10, 2007 i had missed period. by the way last month i had my period but it lasted only for three days... it was very very very light only... normally i had 6-7 days period.
got diarrhea for three days
tender and very sore nipples... enlarge breast
headaches
lightheadedness
nausea
vomitted only twice but not in the morning usually
gained weight
food craving but no specific likes
dizzy
lately i experienced severe constipation
urinates 8 times by daytime which is not normal to me
and same at the evening almost 8 times also
felt like cramps in my lower left abdomen...
yesterday i had pinlike pain in my lower left back... its like gas i dont know
bloated
always feel like i ate 5 plates in a meal
catching my breath after walking even from bedroom to bathroom only.
and now i got light pink discharged after we had contact with my husband..
negative pregnancy test by august 16 2007
your reply will be very helpful so i can sleep at night