My gf and i had protected intercourse, she lost her virginity that time. i didn't ejaculated inside. i pull it out, i continue ejaculate outside using my hand. she is 8 days late on her period, is she pregnant? if not what's the reason?

She might be pregnant as sperm are present in the pre-ejaculate fluid and can impregnate. She should run a pregnancy test.

Pregnancy definitely needs to be ruled out so your girlfriend should get a pregnancy test done-follow the home pregnancy test instructions carefully. If she is not pregnant, there could be many reasons for a late period, including a cycle without ovulation. If she doesn’t want to get pregnant, she should see her doctor to discuss a better birth control method. If you don’t want STDs, use a condom.