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As you are 42 yrs old, chances of conceiving naturally is low because as age advances quality of egg becomes poor and fertility
decreases. Your periods are irregular which suggests there is hormonal
disturbance. As age advances store of eggs in ovaries also decrease. You need aggressive treatment rather than waiting for things to happen. I would suggest you to undergo 1-2 cycles of IUI combined with ovulation induction( Ovofar
treatment ) and if it is unsuccessful IVF treatment will be best option. Even with IVF, success rate is low at your age. Other option is IVF with donor eggs which has good success rate. Take care.