 [ Symptoms ] 4 yr old son has a rash that comes and goes no other symptoms dr do not know what it is need help please no new detergents or foods nothing has changed in the environment he lives in sometimes it itches sometimes it does not er drs say its a viral thing because they do not know [ Disease ] hi when you say your cycle this means your menstrual cycle ovulation is just a 1 day thing and it happens mostly around day 14 give or take a day male sperm needs to be in place around 3 to 4 days before that day its take male sperm 3 days to get in place to receive your egg either side so sperm splits up and goes to both ovary is and can live for up to 7 days if it gets there after day14 your probable safe did you get spotting around day 21 but some times you may not notice this happen good luck