When should I test?

I'm two days late, and I know it's too soon to tell. I have been having nausea, dizziness, swollen and extremely painful/sensitive breasts (small amount of thick milk) We've been trying to get pregnant for six months and I can't bring myself to be disappointed again. Help!

****UPDATE***

My period just arrived today, and I'm doing my best to not fall apart. I will be making an appointment to see whats going on. Baby dust to all you wonderful women! I'll keep you guys updated.