I remember having a terrible ache between my legs, just like I'd been kicked and was bruised, but there was nothing to see.. or no way of seeing anyway!
you can also get trapped nerves as baby moves. it's a nightmare! don't panic but if you're really concerned you should have a telephone number for your maternity ward. give them a call for some reassurance.
another tip? enjoy the last bit of peace and quiet! go to the cinema, do the things you won't be able to do with your new baby.
good luck.. how exciting!