If you usually have regular cycles, it is best to exclude pregnancy
. You can have a urine test 3 weeks from your unprotected intercourse
with a fresh early morning sample. If you do not get a definite result, you may get another test in a couple of days. If you wish to have a better confirmation, you can get a blood test
as well as a trans-vaginal sonogram. Please see a specialist for further support. Take care.