Hi psychick, sorry i couldn't post any more last night. It let me post the first answer to you and then it was taking ages to load a page so i gave up lol.
Glad you're feeling better today. I remember with both my pregnancies, especially in the latter stages, every twinge,tightening, pain had me looking up the pregnancy books lol. The latter stages of pregnancy put a heck of a lot of strain on your body, so it could just be the babys position.
Don't feel put off about calling your maternity unit if you feel unsure about anything. That is their job and they shouldn't make you or any other woman feel like a nusiance.
Have a great day tomorrow for your daughters birthday, but don't tire yourself out, let others help.
Take care xxx