I Had A Rotocuff Repair. It's Been Four Weeks And

I had a rotocuff repair. It's been four weeks and progress has been good. No pain and the arm moves quite freely however I have not tried raising it above 90 degrees which is fine at this stage. I sleep with a sling each night and continue to wear the sling if my shoulder is sore. Having been wearing it consistently for four weeks yesterday. I have an extremely sore bicep. Is this normal ?