Well, I wouldn't let other people (other than your partner that is) help to decide whether you bring another life into the world, firstly.
Secondly, sharing a bedroom is no big deal. Even for different genders, who won't need their own privacy for a lonnnnnnnnnng time, there are ways to create that if you are willing and well.. creative
Your finances sound okay, but that isn't a deciding factor in my book anyway. Of course, it is wise to choose to get pregnant when you are in a good financial state but we were extremely poor financially when I got pregnant and we did just fine (dd is 3 and we are much better off now financially).
If you waited until your daughter was two to try to conceive (which is not long at all), that would give an approximate 3 year difference depending on how long it took to conceive which I think is a pretty good age difference.
I think though, that you should be at peace within yourself and with your husband before moving forward. It sounds though, like you are ready. Do you honestly think the family who are "not sure" about it will think twice when they see that adorable bundle? They will melt like puddles, cmon.