Hey Amanda-Jane,
It does sound like what the other ladies are describing. AT my early pre-natal classes we had a physio that showed us a pelvis (bone cast) and showed the three sections that make it up. This is why some women get back pain also where the pubic bone joins the spine. She mentioned pelvic tilts that you can do to strengthen the muscles holding it all together. The bones and ligaments relax during pregnancy, which is why they ache. Definitely see a physio or your OB for some gentle exercises you can do. If you are in so much pain that you are crying, it sounds like you deserve some relief,

Good luck!