Why am i still spotting and having cramps and nausea one week after ovulation? u/s shows fluid in uterus. no infection present.

Need more info: Usually fluid in the uterus implies blood. Not always, but often. If you aren't bleeding, then i'd wonder if you recently had a procedure that could have caused scarring of the cervical canal, preventing the blood/fluid from draining? Sometimes, ovulation isn't successful, and we get a persistent cyst that can be painful and leak fluid outside the uterus (they would have seen that on ultrasound).