HELP! Need some reassurance

AF was due on Tuesday so I am 3 days late...I've been taking tests since Sunday & all came up positive...however, yesterday I spotted like twice & have been feeling extremely light cramps since then...I took a clear blue digital test last night & it came up 'not pregnant'. I haven't gone to the doctor yet to confirm/deny as I've had 2 chemicals in the last 3 months & want to wait until I'm officially a week late...

Should I just wait it out until next Tuesday then call my doctor?!

What do you ladies think???