Brown discharge

Hi. Im so worried. Im 50 on HRT. I use Oestrogel 3 pumps which was upped from 2 in March and Ustrogen 100mg 1 tab at night.  Im on the mini pill  which ive taken for years back to back so never had a period.  Ive started to have a small amount of brown discharge this week only when i wee. 

Ive booked an app with nurse but its not until June.