I just took her virginity, but now she's acting different

Anonymous
for our 7 month anniversary my girlfriend gave up her virginity, it was something we were both looking forward to, and something we both seemed to enjoy...but in the past week she's been acting really weird, and becoming more distant. She always has something else to do or somewhere to go rather than be around me, and I don't know how to ask her about what's wrong without leading to a break up, let alone what to do to try and save our relationship if I can't avoid the break-up conversation.
I just took her virginity, but now she's acting different
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