[header] How to determine fertility [title] Understand the biology of your body. [step] Most women are only fertile for a few days out of every. [substeps] During ovulation, when the ovaries release an egg, your body has a short window during which the egg can be fertilized. 
For this period of time, you are considered fertile, and conception is possible. Sperm can survive in a woman's reproductive tract for up to five days, meaning you could potentially become pregnant from intercourse that took place prior to ovulation if the mucus conditions in your body are receptive.