For people in order to become fully what God intended for them, they should never "split the gift" that God gave them, deep, giving marital unity..and fecundity.

We shouldn't pick at the gifts.  For the relatively small number of cases, if having children truly is medically dangerous...not simply inconvenient, annoying, troubling, conflicting with "career goals"....then the Church has an answer for them..but it too may involve a bit of denial, a bit of effort.

So what...right?..we often 'assign' too much importance to our own gratification. It's not the end of the world  to deny ourselves....the sacrifice can actually be nicely sanctified.  It can also lead to deeper personal unity with one's spouse.

Regarding "goals".  No. The goal must be much more than the sort of secular goal you offered. 

The goal is: "marital love that grows beyond itself through contnuous & heroic gift of both the husband and the wife.  Total trust in God, and more, love FOR God through their marriage."