Hello, I have gone through your query and understood the concern. If you happened to be in the fertile period during the unprotected intercourse, you have good chance of conception. Ovulation occurs two weeks prior to the onset of the next period and this is the fertile phase. It is true that the preejaculate contains enough sperm to cause conception. The green colored discharge is not normal and needs to be examined. Also, you have to wait for your next natural period and go for further management if you miss it. Hope this helps.