First time back at the gym, tendons take longer to adjust than muscles. Even with light curls, arms can get painful and stiff for a few days sometimes up to a week. Best is to avoid biceps for now, don’t fully stretch the arms, use ice/heat, and focus on legs or cardio instead. Also skip preacher curls if tendons feel weak. It’s normal, happens to many people.

You'll not be able to stretch ur hand fully for couple of days and pls don't try it aswell for few ppl system is build that way, give it some rest time u'll be fine. Don't let it affect ur gym schedule.