Probably yes. Entirely stupid.
I have a 10-year-old son, I got pregnant at the age of 18 while in the middle of my A-levels. The father who was 21 (looking back) was a complete moron, and going nowhere really at that time in his life. He decided not to have anything to do with our son, and despite contacting him/his family members when our son was born I never heard anything from them and I assume my ex has always denied his existence.
Fast forward 10 years, and ex has another son (aged 5). He pays me maintenance (forced through the CSA), but we have had no contact in all these years. Today I decided to Google him, out of boredom and came across his public social media profile. Apparently ex has started up a business, is no longer the bum he once was, is seemingly the best and most proud father in the world, travels often etc. Not the man boy I knew. Out of nowhere I had a pang of bitterness. The mother of their child was obvious, so on a whim I contacted her to say I had a child with my ex, he was 10 and that perhaps in the future he may contact either his father or sibling and to be aware of this possibility.
I am in a VERY happy relationship with a good man, I'm due to give birth in 4 days. I honestly don't know what came over me! Anyway, her reply was "what am I expecting" from my message, and unless I have any evidence to prove my claim to basically get lost. Obviously there is little point in going backwards and forwards with it, as she will ultimately believe what she wants to.
I just can't believe after 10 years I am feeling so upset over this, I have had so many life experiences and being a dumb teenager is well and truly behind me. I also feel so bad for my son, I can't imagine him ever seeing that himself.