Had sex with boyfriend. only used condom halfway through. finished in condom, but next day i smelled what i think was semen. could i be pregnant?

Eventually-yes: It takes a few days for the process to happen, but yes,you can get pregnant this way.To use a condom properly it must be applied prior to any intercourse and sex stopped if it slips off.Any mucous secretions from a stimulated penis have enough sperm to trigger pregnancy.Do a test if you are late and if you luck out consider altering your BC practices before you are.

The nose "knows": Trust your nose as the condom and your boyfriend "sprung a leak" of the impregnating kind. Do a pregnancy test if your period is late.