Hi welcome to H.C.M.Forum. to conceive is not a matter concerned with women. of course irregular periods
is one of the causes for infertility
. both the partners should consult a gynaecologist or a fertility clinic.
if the period is regularly irregular means every 40days or every 45days lke that you can caliculate the ovulation time. it is 14days prior to the expected date 5days before &after are the conceiving days. and veginal thermometers are also available to confirm the ovulation, it is 1degree more than dailv.temperature.
besides i advise male above mode of sex. female should not get up immediately or wash.
wishing for a beautiful baby soon.