Oh there are chances that during intercourse due to weight bearing and sexual activity your hip had suffered injury. If your wieght is low or you do not have optimum fat on your buttocks , there is possibility of friciton with bed. And yes your pubic tubecle means a part of bone and hard surface of bed caused injury to in between soft tissue and muscle likely. So just consult doctor , take some painnkiller and antiinflammatory medicines to relive from pain and further comlicartion. And also get advixe from doctor that what precaution to be taken durig sex in terms of bed surface, your position and your partner s weight. Thanks.