When is the earliest (a week,2?) u could take a hpt if u dont get your period anymore? mines stopped due to bc so how would i know when to take hpt?

Three weeks: You may do a home pregnancy test about three weeks after the episode of sex in question. Conception, as defined by the generation of a fertilized ovum, occurs within day or so of the sex. However, it takes about 2-3 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. If the result is negative repeat the test in 4-5 days. Use first morning urine and follow instructions for the test carefully.