Pelvic Pain. HELP!!

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I am 19 + 3 and suddenly today I started having pain in my pelvic/groin area. It's like muscular pain. You know like when you have done too many sit ups. That type of pain. It hurts when I walk and when I turn in bed. I checked google and saw something called pelvic girdle pain. Has anyone had this? Is it normal? I am a bit worried.