had sex 6 days ago and ever since ive felt sick ?

Hi,
Welcome to ehealthforum,
Few women can experience early symptoms of pregnancy as early as 48 hours after fruitful intercourse. If the intercourse was unprotected, and if you are not on any form of regular birth control measures, chances of pregnancy are possible (especially if you were during fertile days/close to ovulation time at time of sexual contact). Wait and watch for your periods. Look out for development of any other new symptoms if pregnancy is suspected. If periods do not start within 10 days of expected period dates, or if you get abnormal periods, or if you suspect chances of pregnancy, consider visiting your doctor/gynecologist at the earliest for thorough examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately). If pregnancy gets ruled out, and if you are not ready for pregnancy, but intend to remain sexually active, you should consider visiting your gynecologist to get started on suitable regular birth control measures to be protected (after your periods). Be regular with birth control use as instructed. Avoid having unprotected sexual contact if you are not ready for pregnancy.
Take care.