My boyfriend and I were messing around, and he went inside me about 1/4 of an inch. He didn't cum or anything, but I am worried about precum. I heard that precum can only contain pre existing sperm from a previous orgasm. I also know that urine flushes it all out. He hadn't had an orgasm for a day or two before. Do you think I could be pregnant from the precum if he hadn't had a pre-existing orgasm?