*URGENT* is my guinea pig pregnant *URGENT*?

My guinea pig might be pregnant due to a friend putting her (Josie) with the male (Bandit). She said he was whining for her so she put them together. We all ready got mad at her cause we know that pregnancy can kill the mother. This MIGHT be her second time. The first time was an accident cause the pet store said they were both males. But anyway Josie looks semi-pear shaped, doesn't like to be picked up, (she usually loves to be held) sleeps a lot, someimes irritated, eats and drinks a lot, and Bandit doesn't try anything. Please help this is very urgent!!!!