Can you get pregnant if you have sex during your period?
Generally speaking, "big aunt" refers to menstruation, and pregnancy refers to gestation. Having sexual intercourse during menstruation usually does not lead to pregnancy. A detailed explanation is as follows:

Pregnancy requires the ovary to release a normal egg, semen to contain normal sperm, the egg and sperm to meet and combine into a fertilized egg in the fallopian tube, and the fertilized egg to successfully implant on the uterine lining. Any abnormality in these steps may prevent pregnancy. Women typically do not release eggs during their menstrual period, so there are no eggs to combine with sperm, making the formation and implantation of a fertilized egg impossible.
Although the chance of becoming pregnant during sexual intercourse while menstruating is low, the cervix is open during menstruation, allowing vaginal bacteria to cause retrograde infection. Pelvic congestion may occur during intercourse, easily leading to endometritis, pelvic inflammatory disease, fallopian tube inflammation, and other conditions. Additionally, the insertion of the male penis during sexual activity may cause congestion of the female genitalia, leading to increased menstrual flow and prolonged menstrual period. During sexual intercourse, uterine contractions may squeeze fragments of endometrial tissue into the pelvic cavity, causing endometriosis and potentially resulting in female infertility.
For the health of women, sexual intercourse should be avoided during menstruation. Personal hygiene should be maintained during the menstrual period, keeping the external genitalia clean and dry. If having sexual intercourse outside the menstrual period, appropriate contraceptive measures should be taken, such as using condoms, intrauterine devices (IUDs), etc., to reduce the risk of unintended pregnancy.