Yes you may have Hamstring strain. A hamstring injury can occur if any of the tendons  are stretched beyond their limit- during sudden, explosive movements, such as sprinting or jumping,During the first two or three days, you should care for your injury using RICE therapy: Rest – keep your leg as still as you possibly can and avoid physical activity,crutches in more severe cases. Ice – apply cold packs 15 to 20 minutes every two to three hours during the day. Don't apply ice directly to your skin. Compression – compress or bandage the thigh to limit any swelling and movement that could cause further damage. Elevation – keep your leg raised and supported on a pillow .