OP, the lack of the birthday present, is lazy, selfish and self absorbed.
I think lots of men can get wayyyyyy too comfortable in their relationships, and it's not good at all because it pisses women off and builds resentment.
I remember early in my marriage my lovely husband forgot our second anniversary.
He arrived home to a special mid week meal with his hands hanging!
I was very hurt. He could see it in my face. Flowers would have been enough, just a token. It just really hurt me. I remember saying to him that I loved him very much, but not to take it, or me, for granted, as it wouldn't end well for us.
I wasn't angry, I was very pragmatic.
He heard me, and it never happened again.
I think you are right to carry on with TTC.
But I also think that your husband is just too comfortable.
I think sometimes, people who are too comfortable, too well looked after, too accommadated, become too selfish.
I would take this opportunity, this year, to hugely focus on yourself and a life outside of your relationship.
Look at sports, hobbies, interests where new friendships can be forged.
You need to Mind You.
He's a nice man, but he's minding Him.
Hope that makes some sense. 💐