What should i expect from having a unilateral salpingo-oophorectomy?

Depends: If this is done laparoscopically you should have very few issues postoperatively. Pain at the incision sites can last from less than a week to more than 2 weeks depending on lap vs. Open operation. Bleeding and infection are low risk unless this is being done for tuboovarian abscess. A lower abdominal incision can have a chance of hernia development.