Accidentaly forgot to Block email external pictures

[funnymacaco]

I manage all my stealth account emails on my smarthphone on Gmail App.
On one of the emails, I forgot to disable external pictures and I opened 2 or 3 emails from paypal. Is the account now Linked to any of the others?
I also used this phone to see the emails of my non stealth accounts before I knew stealth.

[funnymacaco]

Sorry for the (double) silly question but I'm no expert at all.
I figured that cleaning the cookies would be great, so I cleaned them from my only 2 browsers on my smartphone (custom browser and google chrome). Is there any way of cleaning the cookies of the gmail android app? Or cleaning them from the browsers is enough?