What pregnancy tests do you recommend to use or buy?

I took a test on 15-16 days a go and it said negative, and yet my period was sposta be here on the 6th of November, it never showed up. a few days later I had spotting for a couple of days. and my sencond missed period will be on the 3rd of december. My last period I had was on the 10th of October and I have a 29 day cycle. My period has been regular like clockwork since i was 10 1/2, and i'm 18 now. So before I go buy some more test I would like to know what brands u recommend. Thanks!!! =D