conceiving

When Ms Park and her husband had trouble conceiving, they looked to fertility treatments.

In total, only 12% of people cited infertility - or difficulty conceiving - as a reason for not having the number of children they wanted to.

Corinne also has endometriosis, which can make conceiving a child more difficult.

The NIH lists some possible risk factors including prenatal exposure to pesticides or air pollution, premature birth or low birth weight, maternal health problems and parents conceiving at older ages.

The last connects to the bleakest memory outie Mark and his wife share – a miscarriage that followed months of difficulty conceiving.