What Could Cause Swelling In The Vaginal Opening After Sex?

Hello doctor, I am an 18 year old female. I been having sex with my boyfriend for a year and a half. We do not have any STD s or HIV. We are both clean. Recently in the past 4 hours, we had rough sex for about an hour. The problem is after we had rough sex, my vaginal glands covering the vaginal opening both above and under the vaginal opening is very very swollen. He did not use a condom nor did he ejacualate either. It does not hurt but it feels very uncomfortable when I sit down. I m trying to be very specific. It would be helpful if I could send you a visual photograph of it online. I m very worried because it looks abnormal. Hope you can help. Thank-you.