Ouchy

So my boyfriend and I have been dating. little over a month now and he's so understanding with everything. He has more experience with other girls (before me) than I do with guys and that was intimidating at first. I'm a virgin, he's not. I was finally comfortable enough to let him finger me the other day and I don't really know what I was expecting but I feel like it kinda hurt, especially afterwards. Like there was lots of pressure, is that normal? If it's normal for a finger or two to cause a little pain what's going to happen if/when we have sex?