How long did it take you to conceive?

Me and my boyfriend have been together a while I'm 19 he is 23 and we are ready for a baby. We are living together and have been since we had been together 3 months and we have talked in depth about trying for a baby we have plenty of income to support a child. We have now decided that this month we will try so I have started taking prenatal tablets and I am using ovulation tests ect (boyfriends idea) but my boyfriend is a worrier and he keeps worrying about the chances he can't have children ect although he is a very fit and healthy guy he is worried about failing me and the relationship if we don't conceive soon even though I have told him not to worry and to not look at it as trying to have a baby but to just look at it as us having sex like normal and it will happen when it happens. Please can you tell me how long it took you from deciding to try to conceive to falling pregnant so I can put his mind at rest that it can happen straight away and for other people it can take years.