help! what would you do.

I am in a same sex relationship. My fiancé gave the go ahead to start trying for our own family. We have a donor that is already willing to help. I was a surrogate a year ago and the baby will be 1 on Thursday which gives me the go ahead. My doctor suggested waiting 1 year after my csection so that's what I did. Well.. Last week it wasn't for sure that My fiancé was on board with trying yet. We were talking on Saturday and she said "yes!" Well on Friday (I think Friday), I had went to the library to look up dates and prices of cruises. I found a couple I was interested in and thought "I'm gonna start saving up for this and surprise her for our two year anniversary in November. Well after that plan, she hit me with the "we can try!" Well now I'm stuck with... Should we start a family (I've been ready for years and want this) or should we take the trip first. Either way, one or the other will always be there. We can start our family, and always be able to go on a cruise. Or we go on a cruise, cause trying for a family will always be there. It's hard! Then I think about timeframes, we don't want to be pregnant all summer long because of my HELLP syndrome and when I get to warm, my blood pressure goes up.. So summer pregnancy wouldn't be good. Which means if I get pregnant in August, I'd be due late April cause I have to have a csection around 36 weeks.... I don't know what to do. 

I know I have the option of getting pregnant, having the baby, and waiting until the baby is alittle older and then mommies can go enjoy a cruise. 

Help please!

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EDIT! I'm not worried about trying to bring the baby on the trip. I have multiple family members around that have already offered to watch the baby if we went that route and I know the baby would be well taken care of.