Help!

My boyfriend and I had sex Wednesday, 6 days before I’m suppose to get my period. He wasn’t thinking, and apparently neither was I. We didn’t use protection and he came inside. My question is, what are the chances of falling pregnant? Has anyone else fallen pregnant that close to their period? Did you still have your period, or did you skip it? Kinda freaking out and overthinking everything. 😳😳😳