missed period.

I had sex October 4th. A condom was used and I then had my period (as scheduled) on the 6th. i missed my period in November and took a test which both were negative. i'm now 30 days late, i've been feeling sick here and there ( which i don't eat much so i'm assuming it's from that) and i'm supposed to start tomorrow. If I don't start, should i test again?