Me and my girlfriend always use protection. However in my home country birth control is still sort of a tabu; so on top of condoms use the ovulation calculators. Her previous period Started on the 18 of April and ended on the 14 of April. He had protected sex.with a spermicid lubricated condom plus I did not ejecualt on the 22 of April what are the odds she could get pregnant since I understand we did it during her fertile window??