Any Possibility?

I know this sounds probably super paranoid (which it is) and immature, but I’m needing some mental reassurance. My period is supposed to start in 4 days and Ive had no symptoms other than sore boobs (ugh), and my boyfriend and I are not sexually active but we did grind with my leggings on but he had nothing else on. Is there any way in hell I could be/get pregnant? I know it’s extremely unlikely but I’m just very paranoid over little things haha.