Thanks for your query.
I read your query and I understand your concerns.
Following is my reply:
1) The pain you are experiencing may be due to ovulation of few smaller follicles which might be ovulating late if your IUI was recent.
2) The pain might be due to small strain and nothing major.
Hence I dont see anything to be worried about. Hence be relaxed and stay positive.
I hope I answered your query. I will be available for any follow up query you have.
Dr. Mahesh Koregol
IVF & Infertility