I was wondering i have sex with my partner and im trying to get pregnant do i wait until the 21st of december to take pregnancy test or today ? the 21st is when supposedly i get period?

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.