Its been 13 since unprotected sex. my period is irregular i dont know when my next will be can i take a pregnancy test will it be accurate please help?

Get tested/seek help: A betaHCG blood pregnancy test will tell you if you are pregnant 10 to 12 days after unprotected sexual intercourse with a fertile man. Because the risks of an unplanned pregnancy at your age are quite serious and very significant, it would be wise to seek contraceptive counseling from a knowledgeable gyn and request the most effective method to prevent pregnancy I.e. an IUD or a subdermal implant