Am 39/childfree & it's not uncommon on CF boards to read posts from other mothers who feel just like the OP.
Personally, it seems to be quite prevalent amongst IVF parents which is understandable when you think about it.
You've gone to so much effort financially/health wise just to have the baby that motherhood is built up in your mind as this pinnacle, a goal to strive for that once you achieve you will feel complete in life.
It's drilled into us socially that motherhood is the biggest achievement a woman can have & if you aren't a parent your life is missing something.
The reality is that parenting is often stressful, infuriating & drudgery, with some lovely bits sprinkled in.
Once the child is born you are going to face the exact same struggles & issues that anybody else does. Your life isn't automatically wonderful just because you have a baby in tow.
This realisation must come as a massive shock & lead some IVF mums into feeling regret.
Then the situation is exacerbated because the poor woman feels like she can't voice her feelings, because others will point out how they are wrong to feel the way they do because they went to so much effort to get pregnant in the first place.
I think more should be done to communicate to those seeking IVF that motherhood not a cure all & will not automatically lead to a happy & fulfilled life. That maybe this is the world's way of telling you that motherhood may not be your path in life & that's OK!