Postpartum help

So I’m 7 wks postpartum. I had a vaginal delivery everything was fine I was cleared at 6wks and had sex several days after just one time no condom and two days later started with this heavy clear discharge that shortly after turned yellowish green and mucousy. I have had this for almost a week my vagina is now red sore and inflamed. I had a culture done and I don’t have anything the culture was negative for everything they tested for. But symptoms seem to be getting worse. Has anyone had anything like this?!

Edit:

I have seen the ob multiple times now.