What Causes Vaginal Bleeding After Applying Gynatrof Gel On Vagina?

I am talking Estrace and prometrium and my doctor gave me gynatrof gel to appli into vagina for 7 dans in a row thon twice a week. I applied the gel l astuce night and today i had a bit of bleeding...my menstruations stopped 15 yrs ago...i did not apply any tonight...am i corect...