About 80% of couples conceive within 12 months of trying, so if you aren't pregnant despite having frequent and well-timed sex for a year (or half a year, if you are over 35), you may have fertility issues. You can't conceive if you don't ovulate. Signaled by irregular periods or absent periods, anovulation is often connected to being very overweight or underweight, exercising excessively, experiencing very high stress, or having PCOS. Painful periods or pelvic pain can also be a sign of infertility. Up to 30% of conception failure is linked to male infertility, but because there are no obvious signs, it's a good idea for your male partner to get a semen analysis if you can't get pregnant after many months. Additionally, 30% of couples will not know why they can't conceive, and may not have any signs or symptoms other than not being able to get pregnant.