Wasn't invited to by boyfriend's birthday gathering

We haven't been going out that long. We been friends for about 4 months and have been dating for a month. I asked him tonight for the first time if we were 'together' and he said yes and that he thinks of me as his girlfriend. He deactivated is dating profile a few weeks ago and he's really affectionate in real life and kisses me in public, etc. So I'm a bit confused as to why I haven't been invited to his birthday gathering this weekend... I've been thinking that it could be because it's at his friends' place. But even so, he should still be able to invite me as it's his birthday after all. And there will be a mix of female and guy friends so it's not a boys' night out. I haven't met his friends yet either. Part of me wonders if they even know about me. He knows I'm free on the day of his birthday thing. I even felt like he was rubbing salt into the wound when told me 'it's only Tuesday so there's still time for me to make plans for the weekend.'

So I'm upset. He did say at first that he'd like to have a special day with me too but didn't bring that up tonight. He mentioned a weekday dinner instead and nothing about it being a birthday thing, so I feel like he doesn't want to celebrate it with me at all.

Am I just overreacting? Should I say something to him afterwards? I don't want him to invite me just because he felt bad or something.

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