If you have intercourse on the first day of ovulation, you have a very high chance of getting pregnant if there are no other special circumstances. The egg will enter the fallopian tube in about 10 minutes after it is released and will unite with the waiting sperm to form a fertilized egg, which will then enter the uterine cavity under the peristaltic movement of the fallopian tube and become pregnant, so the chances of getting pregnant during intercourse are very high. If you plan to get pregnant, you can choose to have intercourse at this time and basically you will achieve your personal desire and will achieve pregnancy. If you are not planning to get pregnant, you should use condoms for contraception during intercourse.