1.risking your spouse early to have an extra combatant (or channeler as I use her) but potentially being easier for her to get killed and let you without heirs (and knowing that you cannot marry again, that's quite a huge of disadvantage).
2.let the spouse if safe place. At least unit you have got the max kids possible (4) from her (him if you go female). Once you have all the babies, it's not so important if the spouse dies (hopefully not, specially if channeler).
Pretty much... and those can be summed up as:
1. Warrior queen.
2. Pregnant and barefoot in the kitchen.
The problem with the warrior queen route is that you cannot remarry if something bad happens... this means #2 is the only sensible choice.
PS. Its dynasty not dinasty