As females get older the chances of conceiving each month reduce. From 35 to 40 years your chance of conceiving each month is 10-15%. After 40 years of age it can reduce to as low as 5% chance each month. Your chances of miscarriage also increase after 35. The amount of women having babies after 35 is increasing and many do conceive without problems or having IVF but you do have to be aware of the fertility time clock.
Ovulation calendars
If you Google fertility or ovulation calendar alot of sites will come up.
Ovulation calendars show you most fertile days for getting pregnant. Plans are based on the fact that, for most women, ovulation happens approximately 14 days before the next menstrual period. As ovulation approaches, your chances of getting pregnant will increase. Knowing when you ovulate will help you time intercourse that can result in getting pregnant.
Somes calendars will even say if you are trying for a boy or girl, the planner will give you links to other information that will suggest some actions that may influence the sex of the child. Though I am not to sure about this.
Family Planning
http://www.familyplanning.org.nz
He whakamarama mo nga mahi a Family Planning
Family Planning provides sexual and reproductive health information, clinical services, education, training and research.
Fertility Services
Advice and initial investigations for couples experiencing difficulty with conception.
Pre-pregnancy Advice
Advice on what to do before starting a pregnancy.
Natural Fertility website www.naturalfertility.co.nz provides information on sexual and reproductive health