I had sex with my boyfriend and sometimes the next day or later when i am home , i use the restroom and find a little bit of blood / brownish stuff?

Abrasion: Hello Susan If you have a little bit of blood after sex it might be due to abrasions from sex. If there is not enough lubrication during sex the friction internally can lead to abrasions of the vaginal wall. The skin/mucosa of the Vagina in not that thick and with enough abrasions small tears can occur that cause bleeding. Next time try to use more lubrication and always with protection (condom)