SO forgot my birthday

Today is my birthday and my significant other has forgotten. I haven't said anything to remind him. He's still at work. Not even a single happy birthday. Just texts complaining about work, which I have replied with support. He knew my birthday was coming, he knew the day, and I think that it might have just slipped his mind. It just hurts a little because in the past I've worked so hard to make his birthdays special and it'd be nice to be treated the same. Also want to clarify that I don't expect to be showered in gifts or taken on an expensive date, I would be 100% happy staying in bed and watching tv like any old night. I don't want to be mad at him, but I cant really help it. I got emotional about it at work today and accidentally cried, which made me feel so vulnerable and dumb, but hey, I'm pregnant. My coworkers are so lovely and supportive and made my day better. I'm trying to focus on the people I do have and who do care, it's just hard to be happy when the one person you want to celebrate with doesn't even remember. I don't think I'll say anything when he gets home, I'll just let it be, I'm not interested in starting a fight or giving the silent treatment. But man, my heart is a little broken. Am I being too dramatic?