Not sure if pregnant ba ako or not?

hello po ask lang 1 week akong delayed and kinabukasan nagtake ako ng pt pero negative and then nagspotting ako as in light pink to brown ung color and hindi napupuno napkin ko it lasted for 4 days after 3 days nagpt ulit ako pero still negative. pero di pa ko nagtake ulit ng pt since then. is it a sign po ba ng pregnancy?