You may hear people talking about this as sub-fertility.
The first thing to know is, there is no normal. Different women, and different couples, have very different experiences.
Subfertility simply means you and your partner are taking longer to conceive than the average time. It can often take up to six months for a couple to fall pregnant, especially when the couple are older than 35 years.
There is always a sense of time pressure, especially for older couples, however there is often a simple cause. If you have been trying for longer than six months, and certainly longer than a year, there may be other issues at play which are worth investigating.