So I'm pretty sure I'm pregnant.

Although my at home test results have said no, I'm pretty sure I'm pregnant, especially since I've been having period like symptoms for almost two weeks now(cramps, weight gain, cravings) and now I'm a week late with my period. This is gonna sound super stupid, but is it possible for you to know you're pregnant before a test does? (I'm almost 19 years old, for anyone who thinks I'm a young 14 somethin teeny bopper ^^")