my boyfriend and i decided to go for a slight test run without a condom, he pulled out long before he came. i know precum doesnt technically have sperm but sperm from a previous time can come out with his precum. i have no symptoms of pregnancy other than a missed period which is about 5 days late. but my period has always had a mind of its own and its not uncommon for me to miss a period. should i have anything to worry about? and if he hasnt cum in 24 hours will his precum be free of sperm?