Hello ladies, good afternoon. Please advise, it has been 7 months sinc…

Hello ladies, good afternoon. Please advise, it has been 7 months since my C-section. At the first ultrasound two months later, they said there was a discrepancy in the internal stitch. I saw 3 doctors, and they said it wasn't all that bad and there was just a cavity. Everything was fine, then 3 months postpartum I started having regular PMS. The ultrasound still showed a cavity, but they said to come back in 8-9 months from the date of the C-section to say for sure what's wrong. My period ended a week ago. And now, 7 days later, I started having bloody discharges, thick almost brown and mucous. What could this be? It's been like this for 5 days, coming out as if with thread-like streaks. I can't get an ultrasound right now, as we've flown to another country for 14 days.