Low Cervix, Long Dick

Okay, so this guy I met about a week ago has a really long dick. I found out a little bit ago that my cervix is really really low. I've read up on it and the cervix is suppose to move up and down during a cycle. But my doesn't. So I'm worried that he might hit it and cause a lot of pain. Also I'm a Virgin so being uncomfortable or having a little pain is normal. I have told him about my problem and we both agreed that he would have to go I SUPER slow to make sure that if he did hit, then it wouldn't hurt as bad. Is that the only thing I have to worry about or could my low cervix cause more problems then that? He is also very thick, combined with the length, I'm worried. Any suggestions? ?