Hi thanks for your question.
Removing right ovaray along with fallopain tube and appendix
has nothing to do with your bleeding after sex.Neither this can be complication of this surgery.Your left ovary is intact,it is sufficient to produce required hormones.The most common cause of bleeding after sex is cervicitis
that is inflammation of cervix
(lower part of uterus).That is what probably people at sex clinic have noticed.The other common causes include vaginitis
(inflammation of vagina),endometrosis and uterine fibroid
I would suggest you to consult a gynaecologist,who may be able to examine you and may prescribe you appropriate treatment.
Hope this answers your question.