period late?

Sa
So I recently went through all the infertility testing and for the hsg they put me on bc. I only took it for about a week and a half and stooped and the hsg made my period start after for another week. So, my last period was august 1st, and it lasted 7 days, had my test on the 9th and started again, bleeding till about the 15th....and then had a saline test. Now my tubes are fine ect but I have a septum that I scheduled surgery to remove. Problem is I haven't had my period since august 1st and hpt was neg.
Docs say hsg does NOT cause late periods. And I never took bc before and was only on it for a week or so. Any ideas??