Do you think I pulled a muscle if sudden biceps pain?

Possibly. It's relatively rare to "pull" the biceps muscle. Strains or tears of the biceps tendons are more likely. The biceps tendons may be injured near the shoulder or near the attachment just past the elbow. The distal tendon injury (past the elbow) often needs urgent evaluation with an orthopedic specialist because surgery is often required to restore adequate strength with turning the forearm.