Is a urine pregnancy test accurate 42 days after intercourse?

In my view, a properly performed test would be either positive or negative and I' d bank on the results.

Properly performed urine pregnancy tests will turn positive as soon as 2-3 weeks after exposure or when a menses is delayed. Forty-two days is beyond when these begin to turn positive. The hormones that turn a test positive remain present in the urine as the pregnancy continues.

Yes. Conception occurs within day or so of the sex. It takes about 3 weeks for the embryo to make enough HCG for a positive pregnancy test. Blood test may be done a day after a missed period. Home pregnancy tests should be done 4-5 days after the missed period. If the result is negative repeat the test in 4-5 days. Use first morning urine and follow instructions for the test carefully.