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The pain, redness and throbbing sensation is due to possible soft tissue injury
like the skin, subcutaneous tissue
. You need to get an X-ray of the Pelvis to confirm. Are you able to pass urine normally, no blood in urine. If you had internal bleeding
you would have gone faint and cold skin. You need to go to the Hospitally as early as you can ideally but for now avoid riding bike. Take help while walking. If you have any tingling
and numbness of your feet you must rush to the Hospital. Drink plenty of water. Eat protein rich diet. Take Tablet Acetaminophen/Paracetamol
500mg three times a day over food for pain relief. Get examined by the Doctor as soon as you can.