constipation, sore breast, back pains etc. am i pregnant?

Hi,
Welcome to ehealthforum,
The symptoms that you describe (delayed periods, constipation, sore breasts, back pain, feeling pregnant) could suggest pregnancy possibility if you had been sexually active during your fertile days/ovulation time. Consider visiting your doctor/gynecologist for thorough examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately). Urine pregnancy test kits usually start showing positive results after about 20 days post-conception (roughly corresponding to about 1 week after your missed periods). Sometimes urine pregnancy tests can keep showing you false negative results during early pregnancy as the kits are calibrated ones, so unless the hormone levels in urine reach a certain level, they do not show positive results. Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Drink plenty of water. Take adequate rest.
Take care.

i already had a period but the day before i had it i suffered from high fever and severe abdominal pain.its my first time to experienced it (that i thought im pregnant and having a fever and severe abdominalpain before having a period)..