Normal feelings?

I recently had sex for the first time with my boyfriend. We have been dating for a month and a half, prior to that we had been talking for about 3 months. We have known each other for about 7 months total. It was my first time but not his. I was told that I feel different about him after. That I would love him or have other strong feelings for him. However I don't. I'm not feeling different about him at all. I don't love him or have any extreme feelings towards him. I like him but not anymore than I did. If anything we have been drifting apart, but this isn't making me sad or anything, it's more of an ok whatever. Is it normal for me to have such a lack of emotions towards this?