am i pregnant?

Maria

on Monday I took a pregnancy test from Wal-Mart ($.88) and it came out a faint double line about 20 minutes later. Tuesday and Wednesday the same thing. Yesterday i took another test to see if it gets darker and after hours it came out darker but still faint second line again. i have all the pregnancy symptoms. Should i test again in a week on like a clear blue test or something. please help.