Missy, it's obvious that your trainer, and the program you're doing now is working for you. Look at the amazing amount of weight you've lost! And I think it's highly beneficial to have someone explain, and help you understand the inevitable plateaus we all get stuck on.
You're smart to do this while you're young. It just gets harder as you get older. You're metabolism slows in your 30's. And having a family does tend to put weight on people. Not necessarily the pregnancy. I did put on a bit more than I should have with each of my kids, but I'm not going to blame my excess weight on them. ( especially since my youngest is 10!

) But your life does change and it's hard to find the time to work out as you'd like. But you're making fitness a habit. I think that's the key. You have the means now to ingrain this into your head. It will become as natural and necessary as brushing your teeth. If it's already a part of your life, it will be easier to keep in your life once you do start a family.
Going off topic here -- these stars that have their babies, and then show up a few weeks later looking all slim--- drives me NUTS!!! How unrealistic. And then all the celeb magazines, and entertainment shows fawn all over them, comment, and gush about how great they look. I always feel so bad because I know there are women at home who've just had a baby too, and they're looking down at their stomachs, which still look like they're about 6 months along, and they're feeling so bad about themselves. I have so much respect for the stars who don't push themselves to get back into shape. It shouldn't be a contest to see who can get their shape back the fastest. That actress from King of Queens -- Leah somebody -- I like her, because she had the guts to go back on her show, noticably heavier, and just take her time getting her body back. She said her daughter's health and happiness came first, and she wasn't going to worry about the extra pounds. They would come off in time.
ok -- That was a tangent I'm not sure we needed, since I don't think anyone who posts here regularly, except Phil, is expecting a baby. And well, that's not quite the same!
As I said, I have lots of love and respect for all of you. For what you've gone through, for what you've accomplished and for what you've shared.
Carol