If my period is 25/26 days long and my luteal phase is 10/11. can i take a pregnancy test 8 days before my missed period?

Not useful: You would be testing too soon. Conception, as defined by the generation of a fertilized ovum, occurs within day or so of the sex. However, it takes about two weeks for the embryo to make enough HCG to produce 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. Use first morning urine and follow instructions for the test carefully.