It is possible to get pregnant if you have intercourse on May 15, 26 of your period.
If a woman’s menstrual period is relatively regular, with a menstrual cycle of about 28 days, she probably ovulates about 14 days before her next menstrual period, which is about May 29th. After a couple has intercourse, the sperm may survive in the vagina for 24 to 72 hours, so if you have intercourse on the 26th and are not using contraception, it is possible to get pregnant.
However, if a woman’s menstruation is not particularly regular and is often early or late, and ovulation is irregular and may be early or late, then it may not be possible to better predict ovulation, and it will not be possible to predict the chances of pregnancy.
Everyone’s body is different and there are many factors that can affect pregnancy, and it is uncertain whether you will get pregnant or not, so you should keep a close eye on your period. If you are planning to get pregnant, you can use ovulation test paper or go to the hospital to monitor ovulation through ultrasound and arrange to have intercourse during the ovulation period.