Could be he bit his nails a little too jagged this time. Sometimes the angle and/or the condition of the nails makes a lot of difference. Nails also have a lot of bacteria that they carry with them, which isn't good--especially if he hasn't washed them.
If they were freshly cut then they had a chance to be sharp. Next time make sure you are adequately lubricated and see if that keeps the pain away. If it doesn't you should see a gyno just to be checked for anything serious.
No he bites them .... I don't see how it is his nails as hes done it to be before plenty of times
Had he just cut them? Sometimes that makes a huge difference because use has not had a chance to wear them down, especially if he doesn't file afterward.
hes nails are very short and he was just out the shower .... it might have been i wasnt lubricated enough but it felt like a knife going through me
He might have accidentally cut you with his finger nail or you could have just not been lubricated enough. Then there is the even worse one: he could have not washed his hands.....