Advises from mothers are welcome, please advise?

its 2 years after marriage and still no children, we mate eachother very rarely nowadays, but we were together on the 12th and 14th day of my period, so is there is any change on getting pregant,? what may be the reason for not getting pregnant? what kind of foods are favourable for having kids? im a pure veg. my husband eats everything, and basically he is only 24 and me 29, shall i need to wait until he get 26 or 28? he is very irresponsible now and not matured , not much interested in being father, not ready for treatment also.what i want to do?