I had unprotected sex with my girlfriend but i ejaculated outside her vagina. she has not got her periods yet and has been delayed by 7 days. could she be pregnant?

Yes: A woman can get pregnant without actual penetration. If a man ejaculates near the vagina without clothes on, sometimes the sperm can swim well enough to get her pregnant. She should check a pregnancy test. It's important to remember that a positive urine test always means she is pregnant but a negative one isn't definitive since it depends on the hormone concentration in the urine.

Yes: Since she is late, a home pregnancy test will help answer question. Pre-ejaculate has sperm in it and it only takes one. Condoms are safe way to avoid parenthood.