Question

So how long did you wait to test if you were pregnant after you had sex? 
My husband and I have been trying for about a year & 1/2. And well here lately I've had a lot of nausea, headaches, and backaches which can all be pregnancy related. BUT when I've taken a test it was negative, though it's only been 3 weeks. A friend in mine didn't show up for 8 1/2 weeks and you could still barely see it. So do you still think it's early for a urine test to show up.