ACL reconstruction / meniscus surgery

Hi guys! I’m two weeks post-op from having my ACL reconstructed using hamstring graft and meniscus repair. I haven’t been able to straighten my leg since after my ski accident (2 months ago). When I try to straighten my leg, it hurts tremendously and feels very tense and as if it’s going to break. My doctor gave me four weeks to straighten my leg and said to push/force it down. Is this normal?