if she doesn't feel comfortable telling you the pain then you shouldn't be having sex. sex is built on trust and love and I don't really think those two things are that high after two months (They could be though). But I think you should spend time just loving her and making her feel completely safe and comfortable around you before you have sex and especially before she becomes a sub. As a lover of bdsm, I know how hard it is to introduce that into somebodys life... if she can't tell you small things then you guys definitely aren't ready. Also might I add that you should be telling her this, not us on the tsr!!!!