You can have intercourse the day before your period, only because sex can cause pelvic congestion. If you have intercourse before your period, the pelvic congestion will be heavier and some people may have lower abdominal cramps, so try to avoid having intercourse the day before your period, it is not absolute. If some people come back a day before their period because of business trip, they can also have intercourse, but because the pelvic congestion, may make women feel discomfort in the lower abdomen, especially because there may be menstrual blood has not yet flowed out, there is a little bit in the vagina, which means that the pelvic congestion has been heavier, and blood is a better culture medium for bacteria, this time intercourse, generally will bring bacteria into the vagina, it is possible to The actual fact is that you can find a lot of people who are not able to get a lot of money from the internet, so you should avoid having intercourse during your period or the day before your period.