hi so what is it your looking for then but that the idea of spermicidal condoms they give you that bit extra protection. but if she has a 28 day cycle then day 21 should be her ovulation day. do hope this helps. good luck
does spermicidal condoms highers my chances of preventing pregnancy if something leaked during anal sex? percentage? . tested and got a negative when period started. she ended on day 4. day 5 had anal sex tried to avoid ejaculation so it wont spill to her vagina. i did ejaculate but i pulled out. no penetration of vagina. after that i used spermicidal condoms and had normal sex. fairly regular last period was 28 days and tested positive with the ovulation kit around mid cycle. so earliest that she can possibly ovulate is around day 10 i'm guessing