Thanks for you query.
I read your query and I understand your concerns.
Following is my reply:
1) Periods can vary due to anxiety
or obesity etc...
2) If it happens once in a while there is no need to worry. It will get corrected soon.
I hope I answered your query. I will be available for any follow up query you have.
Dr. Mahesh Koregol
IVF & Infertility