I guess as females we have this innate pressure to start families at mid-20's. I was exactly the same, seeing myself married and with at least one child by the time I was 28 (key word:
was).
As a scribe, only 2 of the 26 ER docs were females. One of which didn't go to med school until she was 41. By that time she had 2 kids my age and younger, so she really didn't have any advice to give me on the topic. The other female doctor was married young, around 35 when I worked with her, and never had children. Her and her husband elope to Italy and Belize on her 5 day stretches off.
The thing that convinced me to throw out that damn "have-some-kids-and-get-married" timeline is trying to picture my life as a mother, wife, and physician. No...time...for....yourself. Imagine getting off work after being on call all night, trying to make time for your kids and being a good parent. Imagine being on call all night, working all day, spending time with your kids AND THEN try to spend time with your husband and be a good wife.
It's kind of like a triangle with all 3 (mother, wife, doctor) at different corners. Let's say you make it work and can focus on 2 areas. By doing this, you'll be leaving one of the areas deficient. I'd hate for my children or husband to be one of them.
@Atticum put it perfectly: all of the questions you have don't exist after you have a child. Kids and husbands don't adhere to a timeline and they aren't something to schedule. Be young, take time to think.