Faint line pregnancy test

So I took a at home test about 2 weeks ago and I took two back to back because some of the pee got in the result part but when it was done the line still showed up clear there was a faint second line but me and my fiancé thought it was defective we took the other same thing happened now I’m think that faint-line was a real because I been having symptoms ever since that day ??? Any thoughts I’m going to post my 4th test since we been trying Thursday (FYI 15 days late on my period,cramping and sore breast and nipples)!?! Help