still dont have my periods when do i take a pregnancy test?

Hi,
Welcome to ehealthforum,
After stopping with birth control use, your normal fertility can take about 1 month to 1 year’s time (depending on type of birth control use and duration of use) to return back. There are chances that you can have ovulation (egg release) after stopping with birth control use even before you have your periods/withdrawal bleeding. If you have been sexually active after stopping with birth control use (and you are not on any other form of birth control) then chances of pregnancy cannot be ruled out.
Wait and watch for your periods/withdrawal bleeding. Look out for development of any other new symptoms suggestive of early pregnancy. If you are having symptoms suggestive of pregnancy, or if you have missed your periods, or if you suspect to be pregnant, visit your doctor/gynecologist for further examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately). Urine pregnancy tests usually start showing positive results after about 1 week of missing your periods. These can also show false negative results hence they cannot be relied upon for accuracy.
Take care.