Mother made me feel worse

So I've been disappointed and kinda depressed after starting my period (really thought I was pregnant this time). I was talking to mom about it and told her my boyfriend suggested I start gathering nursery stuff when I can so I'll be ready for when I do get pregnant. Mom said I don't need to do that just in case I can't get pregnant. I wasn't expecting her to say that. I guess it makes sense, but it hurt pretty bad. What's your opinion? Should I wait or start preparing?