I'm not sure I'd recommend this route personally, but I knew a f2m, m2f couple that did just that.
They stopped their form of HRT to have several children during their marriage together, and started back
up when the children were born. Obviously both were preops as well. (at least bottom surgery).
Personally I would think that would be fairly traumatic to the dysphoria if someone suffers from that in particular. Apparently they had enough mental fortitude to handle it both ways.
Maybe this story helps, maybe it doesn't. Honestly I'd be afraid HRT would sterilize many folks after a couple years that becoming pregnant (Or impregnating a loved one) would be difficult to impossible... not to mention the potential side effects to the children from being on hormones.
Whatever you choose to do, I hope you feel comfortable in it

Its your life to live, ultimately, and your choice to make. All I can do is provide examples and thoughts ^_^