wanted to know fe more details.
does your wife always have regular menstruation
or there is some irregularity observed any time.
You had unprotected sex?
by how many days, her menstraution is late?
you wanted a baby, so why are you in tension? Just relax. if menstruation is late by few days, then i will advise to wait for another few days to confirm again by prega kit otherwise you can consult your gynaecologist.