In a regular cycle, ovulation happens between 12 to 18 days. There is a possibility of getting pregnant if the couple have unprotected intercourse during that period. When couples have intercourse, sperms deposited can last there for 48 to 96 hours and sometimes 120 hours. Often, there is a misconception that only pregnancy will happen if couples have intercourse every day.
The average frequency of a newly married couple will be around four to five times a week. And after three to four years, the average sexual frequency comes down to two or three times a week. As long as a couple is trying to get a pregnancy, a frequency of two or three times a week is adequate for conception.