<human>: Can you provide a brief overview of the text?

We are on break from school and return in 9 days, all was yell yesterday we said we love each other before we went to sleep and talked on the phone as usual. 
Today I greeted her with good morning etc, but all our conversations today have her responding with 1 word replies, when i say I love you through text she doesnt say it back, we have classes together next semester so im not too worried. 
Im having a problem understanding why she's doing this, she is currently taking her first month of BC pills for the first time so im guessing shes being moody I have asked her if something was wrong and she denied it.
<bot>: Girlfriend giving one worded responses to me wont say I love you back despite doing it yesterday,I know shes not cheating. Think it may be moodiness from her starting BC.