I Had Little Spottings The Day Before I Met My

I had little spottings the day before I met my boyfriend. To be safe I wore a pad and that day we had a lot of foreplay but no sex at all. I didn't bleed that day at all. But I got my periods (7-8 days) the same night after I came home. My periods are 15 days late this month. I'm worried if by any chance fingering could cause pregnancy if in case he has any cum on his finger but I'm sure he didn't touch himself. I'm just worried. My period was very normal but I'm 15 days late. Help.