The biggest concern is that there doesn't seem to be a concrete end goal for when you can have children. From what you've written, your partner is 25, has an IUD, and communicated that she doesn't want children for the next 10 years. The endpoint of "probably after I finish all my goals/traveling" is so vaguely defined, that it could never happen. One can spend a lifetime pursuing goals and traveling.
You likely already considered the fertility odds, but to add context, according to a resource approved by the department of health for Victoria, Australia [0], the odds of having a child increasingly drop from age 35 onwards. There are also likely risks for men trying to have children after the age of 40, according to a balanced article on WebMD [1].
Negotiation is an option besides an ultimatum, and I actually think most opinions on the internet about relationships go for breakups far too soon. You have valid concerns that you can address with negotiation; in specific:
1) There is no clarity for the timeline of having kids (10 years plus after a vague goal of reaching all other goals of your partner).
2) From the tone of your partner, it's possible she doesn't seem to be taking your valid concern with seriousness, though perhaps serious conversations may just didn't come to mind at the time you wrote your comment.
3) Your partner hasn't seriously discussed the fertility implications of having children that late, at least from the contents of your comment.
To compromise, consider the red lines. Would you be willing to stay in the relationship without kids? If the answer is "no," it's almost inevitable you will be resentful and the relationship is likely to have a very negative effect on your life.
Would your partner be willing to have kids? If the answer is "no," it's also almost inevitable she will be resentful if she reluctantly goes into it; if the answer legitimately is "yes, but after a certain point of time," then you have room to work it out. The compromise solution is to have a specific endpoint when you will try for kids (with a clear "yes" for trying for children at that point). If there is none, moving on may be a hard decision but the right one for personal happiness for both people in the long-term.
As with any online advice, please take this comment with a huge grain of salt because there is an enormous amount of information and nuance lost when communicating a situation over text (or even over a conversation in person). However, the main principles of compromise—knowing each others' red lines, and account for possible long-term resentment due to agreements favoring one side disproportionately—may hopefully still be helpful. Best of luck to you.
[0] https://www.betterhealth.vic.gov.au/health/conditionsandtrea...
[1] https://www.webmd.com/men/news/20141202/older-dads-health