Birth control and a missed period?

Hello ladies,

Need some help! So I missed my period this month. Took a Clear Blue 5 days after my missed period, and it came out negative as heck. It is probably due to the immense amount of stress I've been under (college summer courses, work, etcetera). So my question to you is should I wait one more week and test again just to make sure I'm not pregnant before I restart my birth control (I've not been taking it for a little over a month due to insurance complications) or could I go ahead and start it? I'm pretty certain I'm not pregant. Just looking for some guidance!