AF is suppose to show up today. She usually arrives in the AM however she is not here yet. How accurate are the pee tests. I have heard that it is better to take them in the AM rather than mid day. Is this true? The one I already took today was neg. So I'm going to retest in the morning. I am most likely NOT prego, the timing wouldn't add up. We last had sex on day 9 and I usually don't O until around day 14.