i think that waiting until her DP wants another baby, would be the best thing
and that they have a home of their own and know htey can manage
you have youth and time on your side
what is the hurry?
you need to think long term and work out what your goals are for yourself ..
what career or job you want
where you want to be
where your DP wants to be
but before you start TTC, get your DPs course finished and get a place of your own, then you really can stick two fingers up at everyone who doubted you
if you do blithely go ahead and do what you want without listening to anyone else, least of all the people who are housing you, then you deserve to get a bit of stick
yes, you have been given a bit of a hard time, especially with regards to your writing style, you need to take a few knocks sometimes to understand the bigger picture.
life is not just about coping, it is about enjoying and having fulfillment and not just doing what you want as soon as you want to.. waiting for things makes them even more precious
good luck