Again i have d same doubt! Can she be pregnant??

Last time i mentioned abt me n my gf "trying" to have sex where in i inserted my penis not more than halfway through her vagina n din *** inside her ... m sure f it ... i just put my penis once inside her .. not more than 5 seconds ... she has a period cycle of 29 days ... which means tat she might ovulate on 13-16 CD ... we had sex as mentioned above on d 7th day ... and i dont think my precum had sperm in it coz i had urinated several times after i last ejaculated.... n even if i had sperm left n were carried wit the pre *** to her vagina, it would be dead by d 12th day ... ( n i din wear a condom) .... can this make her pregnant????? PLS HELP!!!