You can’t usually get pregnant when your period has just left, but there are a very few women who ovulate early due to various factors, and there is also the possibility of pregnancy.
Ovulation usually occurs 14 days before the next menstrual period, and the five days before and the four days after ovulation are the most fertile periods, and women are usually more likely to conceive if they have intercourse during this time. The period outside of this period, due to immature follicular development, the survival period of the egg and sperm in the body, etc., is generally not easy to get pregnant, known as the safe period.
Menstruation just gone usually belongs to the early follicular, follicles are not yet mature, can not ovulate, so in the safe period, this time intercourse is generally not pregnant.
However, the ovulation period is closely related to individual physical and emotional factors, and we cannot rule out the possibility that a very small number of women are affected by the above factors, leading to early ovulation and intercourse just after menstruation, resulting in pregnancy.