Maybe the tightenings you are feeling are braxton hicks?? They feel like your whole tummy gets really hard and tight and can be uncomfortable, for some it can be a bit painful but I alwasy found they were just uncomfortable. The shooting pain could be from bub moving down lower and getting ready for exit. I remember walking through a shopping centre a few times leaning so far over the stroller with Izzy because I felt like James was coming OUT the pain in my hoohaa was so strong. Not too sure what the sensitive uterus is though. Is there someone else you can see if you are still worried? Good luck I hope it all eases up for you and you can relax and enjoy your last few weeks of pregnancy.