Thanks for your query.
I read your query and I understand your concerns.
Following is my reply:
1) This may not be OHSS.
2) Sometimes even the egg collection itself causes pain which lasts for 3 to 4 days as the ovaries are punctured during egg collection.
3) you can take pain killers as adviced by your doctor and take rest.
I hope I answered your query. I will be available for any follow up query you have.
Dr. Mahesh Koregol
IVF & Infertility