不是吧。。随便google下 “It can take 24 to 48 hours for progesterone levels to build up enough to raise your body temperature. However, since the egg or ovum is only around for 24 hours, at that point it's too late for fertilization. Charting each day's basal body temperature will help pinpoint your likely ovulatory date and determine future patterns for predicting ovulation. Then you can plan to have intercourse during the 2 or 3 days preceding ovulation. That way, the sperm can already lie in the fallopian tubes, in readiness for when an egg is released, increasing your chances of conception immensely. ”