Actually precum usually does not contain sperm.. however some mens reproductive systems leak sperm into it, so it's unlikely however possible to get pregnant from precum. As for him inserting back inside you.. you may have gotten pregnant who knows! best way to tell is to test!
Screw you guys I'm not :p
There's a very large chance you are pregnant
I have always been told that you are more then likely to get pregnant by the pre *** then the actual ***