Period last month normal on time after missed pill, this month only 1 day of dark blood. can i be pregnant or is it because of missing pill last month? multiple negative tests 46 days after sex. been very stressed this month and dehydrated

Tests are accurate: A urine pregnancy test, done correctly, gives a reliable result 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing a period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon, and thus lead to a repeat test. If a woman gets her normal regular period, then she is not pregnant, and a test is not needed.