When are the highest and lowest chances of getting pregnant? The most fertile days each cycle when you have the best chance of getting pregnant from unprotected sex, are the day of ovulation and the day before – these are the 2 days of ‘peak fertility’. However, due to the fact that sperm can survive for several days in a woman's body during her fertile time there are also a few days before this when you also have an opportunity to get pregnant – these are the days of ‘high fertility’.