If you have unprotected sex for about 15 sec and the guy doesn't cum inside is there a possibility you can get pregnant? what if there was pre cum?

Pre-cum has sperm: One gets pregnant from sperm. Whether the sperm was introduced into the vagina with a penis, finger or turkey baster, pregnancy can occur. Pre-sum is just semen and it contains fresh sperm in it. It only takes one sperm to impregnate an egg.

Pregnancy possible: For the very reason that you intimated. Precum can contain viable sperm which can cause pregnancy if they can reach ; penetrate an ovum.