Is a pregnancy test taken with first morning urine accurate after 40 days since sex . i had my period, on time was just lighter?

HCG: A home pregnancy test should be accurate at 40 s/P sexual activity.

Timing of testng: 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.