If you have intercourse between 24-48 hours after the ovulation test paper appears strong positive, if clinically exclude other infertility possibilities, the probability of pregnancy is almost 98%. The reason is that after the sperm is ejaculated into the vagina at this time, if there is no ovulation, the sperm will wait for the egg in the fallopian tube, once ovulation occurs, the umbilical end of the fallopian tube will transport the egg to the fallopian tube within ten minutes, and the sperm will combine to form a fertilized egg, which will enter the uterine cavity under the peristalsis of the fallopian tube for growth and development, and this is the pregnancy. Therefore, in the absence of other infertility, the chances of pregnancy after strong positive intercourse are still very high, but if there are other infertility, it is difficult to say whether it can get pregnant.