My last period was december 16th i've taken multiple test two had faint positive lines but could have been from sitting there too long, could i be pre?

Maybe pregnant.: Home pregnancy tests are very accurate and not affected by foods, herbs, common illnesses, sexually transmitted diseases, or medications. A correctly done urine test gives a reliable result 3 weeks after sex (3 weeks after when conception) or 1 week after missing a period. A faint positive line is considered positive. One can just wait 1 week and recheck, to get a bright positive line if pregnant.