What are the chances of being infertile?

One month means one chance. Hardly anyone gets pregnant in one month. A normal healthy person has about a 20% chance of conceiving each month. If you are trying for 6-12 months and still not pregnant, then you MAY have cause to be concerned. But maybe not - I know a woman who took eight years to get pregnant, then had two healthy babies. Don't worry about it - just try and see what happens.