Am I pregnant?

My boyfriend and I had sex on the fourth day of my last period, we didn’t use protection and he pulled out before ejaculation. But, I’ve been feeling really hungry after eating some meals. My next period is 9 days away so I’m wondering if I’m just PMS-ing and getting in my head? I tend to overthink everything that makes me even the slightest bit nervous. The app says my chance of being pregnant is low (1%) - just feeling off about it! What’s everyone’s advice? Has this ever happen to you before?