Could she be pregnant, nervous..?

Hi, me and my gf of 7 months, dont usually have , we stopped after our last pregnancy scare, always used a condom. but a 3-4 weeks ago, she grinded on me naked, no penatration, i made sure of it. she was supposed to get her period today, but hasnt. She thought she was going to have it, had to pee really bad? she said. My question is could pre *** get her pregnant, even with no . She was on top of me and grinded for a minute or so before i felt uncomfortable. we are teens. and could not support a baby, it was a mistake and will never happen again. Also, she feels like shes gonna get her period soon, dont know if its female intuition or not.. but im really nervous please help. note, she said she ovulated the 28th, and that means today is 30 days. usually when her cycle ends, shes 15. and we almost broke up. her bro is going to prison so she is indeed really stressed. Please help