Re-Test?!

Deanna
Hey all! So On cycle day 33 ( I normally run about 30/31 days)I took a pregnancy test (CVS brand) I think it was negative, I'm not sure to be completely honest because there was a very faint line but in the opposite direction of what it was supposed to be for a positive. The test is either nothing on a line that runs up and down not horizontal. I am now on cycle day 43 and still nothing! Should I test again? I don't want to get my hopes up.