Its hard to know when you are ovulating if you are irregular, but having sex every other day will increase your chances alot.
Dont use artificial lube or oil.
Ask your hubby not to masterbate, so his sperm are potent.
If you keep track of when you have sex, (i put a heart on calendar) when you get your period, count 14 days back, thats when you ovulated. I dont know how to get your periods regular short of seeing a doctor.
Medications, nicotine, caffine can interfere with fertility also.
Good luck, hope that helps a little.