Hello. My Girlfriend And I Are In A Romantic Relationship

Hello. My girlfriend and I are in a romantic relationship and 1 week ago we played around in the bed with a condom on and I was rubbing against her and the condom broke. We stopped. And then today we were playing around foreplay and I used 2 fingers to go in her. She said it hurt so I stopped. She's been telling me now that her stomach is upset like she wants to throw up and she has cramps but they go away. She said her period should be on the 19th of this month and she's been stressing bout about school tomorrow. I don't want her to be pregnant. Please help. Thank you