Hi Doc I Just Want To Ask Some Questions. My

Hi doc I just want to ask some questions. My normal menstrual period is 7 days and I'm on my 3rd day of period when I had a sexual intercourse with my boyfriend. It's also the first time that he did it inside of me. Then after a day I got a lot of vaginal discharge which color is yellow/brown associated with pelvic pain. I just thought it's normal so I ignored it. And today is the 5th day since I had the yellow-brown discharge and it surprised me that it turned to yellow green color. He is the only one whom i had sex with and same goes with him. Please help. I had undergone a surgery 3 years ago because of paraovarian cyst and they removed my left ovary.