You are still not pregnant. At the end of the week, about 14th day of the menstrual cycle, the ovulation begins. The female gamete released from the ovary falls into the surrounding abdominal cavity and is collected by the Fallopian tube. The internal epithelium of the uterine tubes has ciliated cells that move the ovum or the fecundated egg cell towards the uterus.
The egg is viable only 24 hours. If at the same time, a man’s sperm cell gets into the Fallopian tubes, the egg cell would be fertilized. Sperm cells are viable for up to 72 hours. Thus, the probability of conception is highest during the period of 72 hours before to 24 hours after ovulation. Regular menstrual cycle also varies from 2-3 days, so the chance has a pretty big role in conception.