Really scared , masturbate each day

I'm sorry if this is in the wrong section, but I'm new here and I'm really scared. My boyfriend and I don't have intercourse, but we masturbate each other. The other day he touched me after touching himself. I was on the third day of my menstrual cycle. He claims he didn't have semen in his hand when he did it, but he doesn't remember and I'm not sure. Supposing he did have semen in his hand, is it possible to get pregnant this way? Please, I'm very scared.