faint line??

hii, so the last day of my period was the 18th of february. i had a tad bit of brownish discharge the other night thinking maybe my period was about to start but it never did. i have very regular normal periods, so i took a couple of tests but i dont know if my eyes are tricking me or if there is an actual line there. im going to get a blood test soon to be sure but i would like to know what you guys think!!