Embarrassed but posting haha. Almost birthday sadness.

My husband and I both turn 30 in the next couple of weeks. Been having some change in our friends recently. We just had our first child and it feels like people seem to have left us after that.
Anyways. We tried to get ahead of not celebrating our birthdays (which has happened in years past) and invited people over a month in advance.
Only 1 couple has said they’d come from about 20 people. Not sure how to feel. Just already feel sad and don’t want to even worry about it and just want to move on and not even have the party.
For context, I’m all about celebrating people’s birthdays and have done some pretty big celebrations for friends. Just trying to not read into it too much because I know people are busy with life. Idk sharing incase anyone feels the same and doesn’t want to feel alone!