Took 2 pregnancy tests at differint times about a week apart from eachother, both were negative. i took it 5 weeks after sex. was it right?

Not pregnant : Home pregnancy tests are very accurate. They are the same tests used in a doctors office. They can detect a pregnancy 7-10 days after conception. If you doubt the result you can repeat it in 1-2 days. If you were pregnant the hormone level would rise enough for detection. After this much time clearly you are not pregnant. See your doctor for irregular periods.

Yes, accurate : Home pregnancy tests will turn positive as early as 2 weeks after conception. Since you are testing 5 weeks after last intercourse, it is surely accurate. If you do not wish to be pregnant , you might consider talking with a healthcare provider about birth control options.