Leaning forward on the sofa tonight I felt a painful sharp clunking or popping (v hard to explain!) pain low and central in my pelvis. Now all evening I've been getting shooting pains down there that feel like they are right in my vagina. Especially when I'm standing or walking. Do you think it was baby's head in my Pelvis and that he's engaged? First time I've felt anything like that at 37+3.