Fractured my radius and ulna bones playing soccer. the doctor said no work or soccer for 6 weeks but 4 weeks on i don't feel any pain and the arm feels normal so could i play again?

You can but shouldn': You are more susceptible to reinjuring your arm if you fall or are bumped while playing. This would ultimately lengthen, not shorten, your recovery.

No: I'm assuming your fractures occurred distally( toward the wrist)...If they occurred mid shaft they would require orif ( plating).Irregardless, your fractures should be fully healed before resuming soccer(8 wks) unless your are protected in a 'focus rigidity' or similar splint.Even so, you are taking a definite chance of re- fracturing if you return @ 4 weeks. Good luck!