Name change for this post.
DP and I have one child together, we weren't together a huge amount of time before I became pregnant, but a decent amount of time and were living together etc.
Shorted after our DC was born I found out that the person he was seeing before me had been pregnant with his child (miscarriaged in first trimester) and even prior to that (few years before), someone else he had been sleeping with became pregnant and went on to deliver a baby and claimed he was the father. Apparently he isn't (I say apparently as I do not have 100% proof either way) therefore he has no relationship with this child.
I knew the first woman personally (through work - not as friends), I have never met the second woman at all.
I also didn't find out about either of these pregnancies from him.
AIBU to think he should have told me about them before I became pregnant with our child? Part of me was annoyed when I found out that he never told me, but there's also a slight part of me that thinks if I was me who had carried another man's child, I may not have wanted to say.