Can I get pregnant?

I'm on the 3rd day of my period. I need 1 or 2 more days to be done. I was in bed with my bf & he slipped it in, left it there for about 3 seconds then slipped back out because he said we should go get condoms. Can I get pregnant off of this? & when I went to go clean myself, no blood was on the paper only clear discharge which I'm guessing was mine because I was wet, but is it normal ?