I would take a slightly slower approach. Not sure why you would have suffered this injury in the first place. Perhaps a thorough checkup from your GP is necessary. Full blood tests etc. Also a dietary analysis. Have you recently undergone a large growth spurt or put on a lot of muscle in a short time?
It is important to let this thing heal well, and heal now! Especially if you wish to continue to play football as a good standard. I would have it further investigated on review perhaps via MR1 is possible. You need to demonstrate good union or you'll just tear it off again. 4-6- weeks is for basic fracture knitting and the beginning or ossification. 12 months is close to the time for full strength. So don't rush it and get good sports physio advice.
I would not over stretch it and also I would NOT do straight leg raises at this stage as they are pretty darn tough on that insertion. Movements though range would be ok, cycling, swimming, even some kicking of a ball gently against a wall or to another person to regain confidence in the movement. Also start strengthening other areas that might have been week due to overactive quads, e.g. you inner thigh (adductors) and hamstrings. Let us know how you get on.
Here's a bit more general info:
Avulsion Fractures of the Pelvis
· Avulsion fractures result when the fracture fragment is pulled from its parent bone by forceful contraction of a tendon or ligament
· Avulsion fractures are most common in younger individuals engaging in athletic endeavors
· In the pelvis, the newly formed secondary centers of ossification, the apophyses, are the most likely portions of the bone to avulse
· Since the apophyses tend to form at the time of puberty, most of these pelvic avulsions occur at the time of puberty
· In general, they are uncommon injuries, seen almost exclusively in adolescent athletes with a 2:1 male to female preponderance
· They occur most often in track events like hurdling and sprinting, or games like soccer or tennis
· Most common to avulse is the ischial tuberosity followed by anterior inferior iliac spine (AIIS) and the anterior superior iliac spine (ASIS) about equally