Does your gold pull rate go down the more orbs you have?

Just unlucky, I pulled a Fjorm on the free summon

I mean I got Ayra from the free summon then spent 270 something orbs and got around 8 5*s, two of which with perfect IVs that I plan on using. I like to think that I stole everyone's 5*s, lol

I spent 80 orbs in two days (I made most of them and spent them directly) and I got 4 5* units. I like the idea of
Few Orbs <=> Many 5*s
but I don't really believe it's true. It just feels like because the other day those, who are lucky now, flame about their bad luck and the other way around. In the end it's pure luck.