I did. I had a late life baby after my husband had an affair. It wasn't immediately after but I fell pregnant and was really surprised. We'd reconciled and were trying to make a go of it, our two older DD's were teenagers.
To be honest it was the begining of the end and her birth (once the WOW thing had worn off) things went quickly downhill and reverted back to the old ways, and I was even more tied up than before to deal with it.
I am not sorry, the opposite really, as we eventually divorced and me and DD are just fine and two older children are grown up and independant. But it did not strengthen the marriage, it made the stress cracks even bigger.
Has anyone else thought another baby would make things work? I know its a common thing but wondered really how much it actually works out for couples.