I don't want to tell you one thing, then it turns out that it may be the tangle thing, but DD used to get the all the time too, when I was pregnant with her. I loved it, made me laugh everytime, but importantly she is just perfect, nothing wrong with her now. They did continue after she was born too, which I found fascinating.
Hope all is o.k. though. If it were me, I'd just wait and tell them at your next app. But that is just me