pharmacy switching birth control brand??

hello! i have been on the birth control pill Tri-Estarylla since i got on the pill (a few years ago). now the pharmacy switched me to a generic pill Tri-Femynor. i was just wondering if anyone had different side effects when they switched to a new brand of pill? im just worried that my body is going to react differently. i also saw another post on here when a girl got pregnant off of Femynor so i’m a little scared! any help is appreciated, thank you :)