You can. You can get a sexually transmitted disease (std/sti) any time you have sex without using a form of barrier protection. Condoms, dental dams are important to use if you want to lower your risk of infection. Sex during menstrual period does not protect you from getting an std. You can also get an std via oral and anal sex. Your partner need not have any symptoms to give you an std.
My period ended Jan 20, been having sex since Jan 21 with the same person last sex Jan 24, I had this light brown discharge, what could this be? Std?
The remains of. Menstrual blood high in the vaginal cavitiy.