Crack!

I have a crack in my upper set (I'm on the 7th set now) The movement has happened I'm pretty sure because they are not ultra tight. Anyway the split is on the inner roof of my mouth side and it must have happened after I had my lunch today, as when I could taste blood and I went to the bathroom and they upper set had filled up with blood. I think the split had cut me or pinched me. Oh well I rinsed them out and it was ok. I'm gonna email my Ortho to see if I should switch to the other set I'm due to change into on Thursday. I'm not too sure I will be able to cos I have 2 lots of IPR due, at the front :-( so I'll be gappy soon.