My girlfriend seems different these days?

My girlfriend and I love each other very much although we have only been in a relationship for like a month, or can I say because it's only the first month? We would text each other very often, saying we miss each other, love each other etc. Suddenly, she changed, it was still quite recent. She doesn't text me first, give vague replies, like yea, haha, Ikr. It is always me starting the conv and without me saying anything, no conv at all. I'm stating to think she doesn't want to talk to me anymore and likes me anymore. What should I do?
My girlfriend seems different these days?
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