How soon after unprotected sex can i take a pregnancy test? not sure where i am in cycle. cycle isn't normal 28 days; inconsistent.

One can wait 3 weeks: A urine pregnancy test, done correctly, gives a reliable result 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing a period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon, and thus lead to a repeat test. If a woman gets her normal regular period, then she is not pregnant, and a test is not needed.

Blood HCG may best: If you are very concerned because "your cycles are irregular and inconsistent" and need to know ASAP, a blood betaHCG will usually be reported by most labs to be "positive" about 10 to 12 days after unprotected sexual intercourse /fertilization. If you do not want to become pregnant at this point in your life, seek the most effective contraceptives which are the IUD and the subdermal implant