If I got a positive opk

Victoria • TTC#1 RAINBOW BABY=) miscarriage around 6weeks June 2015. Struggled with ovarian cancer at age 17 only have one full left ovary and a small portion of my right ovary.
Yesterday and had sex that day and the day before but not today because my SO says his back hurts and he's not in the mood will my chances still be the same to conceive since sperm can live up to five days inside me??