Hi, I had gone through your question and understand your concerns. If this happened just once then there is no reason to be worried but if this hapens again then it may be sign of certain disorders, in first case retrograde ejaculation. Other causes include prostate issues or STDs. At this point you should just wait and see if this will happen again and if yes, you should do prostate ultrasound and spermiogram to see what is going on. Also, if there is burning pain during urination then this may be indicating urinary stone which is possible cause of missed ejaculation and in that case you ll need urologic consultation. Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. I will be happy to answer your questions. Wishing you good health.