Unable to squat with quad graft

Hey guys, I'm 3 months post op. I had ACL reconstruction with quad graft and lateral meniscus repair. I can walk decently and am able to do leg extensions, but even mini squats, step ups feel so difficult. I get this weird pain at the graft harvest site when I bear weight while bending the knee! Is this normal with quad graft?! How to get around this?!