Dear Rya
Let me tell you something I have observed.Please don't get me wrong...this is just my observation.
What is happening to you is what is happening to most young couples these days,especially those here in the U.S. After the marriage,most couples want to have some time for themselves to get to know each other,to go around seeing places etc,nothing wrong with that,so the pregnancy gets postponed by a year or two,sometimes even more than that.Then after that time period,the wife wants to work(because of initial visa problems,she might be able to work only now),so again the pregnancy gets post-poned.Sometimes,after settling down in a job,the couple might plan a pregnancy,or sometimes even after getting a job,it will come to going ahead in the job vs pregnancy and the latter always gets postponed.Finally,when the couple decide to go ahead with the pregnancy,that is when they realise that there are fertility issues and then it becomes an emotional battle.
In your case,you are experiencing irregular periods now,so why not go and check with a doctor now itself whether you will have any problems in conceiving.Maybe you can decide based on that.You are still young and this is definitely the right time to think about it.
I can tell you one thing,we can always plan for a child,but it is God who decides everything for us ultimately.Man proposes,God disposes.
There is a lot of debate about contraceptive pills and it is best to avoid it in your own interest.Regarding your question on whether when you plan,it will work out,I don't think anyone can plan exactly when they will have a baby,it is not in our hands at all.