Had sex @ 4 weeks after robotic hysterectomy..could i have an infection. or what problems could i develope?

Should be fine: But do not know if you are experiencing any symptoms. If you develop pain, fever, discharge, nausea and vomiting or other symptoms, call and speak with the gynecologist who did the hysterectomy. If not, you should be ok.

Very little risk: The risk for infection should be quite low by four weeks post op. There is some concern for vaginal cuff incision failure if sex is initiated too soon. Many doctors are recommending 8 weeks.