Should I test again?

I had sex on the fourth of july, and Tested on Monday. Thats 8 full weeks. The test said my results would show as soon as 2 minutes after i peed on the test.

If its been 8 weeks, are my results accurate?

I got a negative. After I peed on the test, there was a clear negative.

I watched the test for about 4 (after peeing) minutes it was still negative.

Should I retest and watch it for longer? And if i were pregnant would it have shown right away because its been 8weeks plus since my last sexual intercourse ?