Here is something I have learned the hard way and I will give it to you as advice. I PROMISE YOU if you will invest your time and do this you will be amazed at your longevity in the sport. I hurt my hamstring and groin in the left leg over a year ago. I would rest it, but then re-injure it until it got to the point I couldn't even squat 135lbs at all!!!! It felt like my groin was about to fall out!
I now have a girl that is a therapist that stretches me out 4 x a week. After only 4 weeks of stretching I am back over 500lb squats for reps again, 1890lb leg presses for reps again and while I am sore I am not hurting. LEARN TO STRETCH and it only takes 20 minutes! You will be glad you did because it elongates the muscle, which allows for more growth and gives you more range of motion...not to mention injury prevention.