If you're serious about TTC (trying to conceive) you probably have a fertility app downloaded to your phone. There are a wide range of them on the market, including Glow, Fertility Friend, Conceivable and Dot, which can make choosing one overwhelming. Some ask that you give them lots of info, including your cervical position (what?), consistency of cervical mucus (um, OK?) and your waking temperature. Others just request the first day of your period. They seem like a great tool, but they can bring on anxiety and might not even be accurate. Here's what you need to know before downloading.

1. They're less likely to work if you have irregular cycles

Apps can't predict the future—they can only tell you what they think will happen based on your past cycles. These apps function solely on the idea that the cycle is going to repeat itself, so they are best suited for women with regular cycles. If you get your period at the same time each month, they will be more on target. Because they can't predict ovulation except based on past patterns, they're less effective for women with irregular cycles. If you have irregular periods, PCOS or are having trouble conceiving, consult a doctor instead of an app.

2. Don't wait until the app says you're ovulating to have sex

Because your app might not be exactly correct—even women with regular cycles might have natural variations that could throw it off — it's best to just have as much sex as possible. It is unclear how accurate these apps are at determining the fertile window. Research has shown with other ovulation predicting techniques your chance of pregnancy is not any higher than if you were having frequent intercourse two to three times per week, regardless of timing. Far too often women will wait thinking that they have to have intercourse on an exact day or two around ovulation. They end up missing their most fertile days. So just have lots of sex!

3. Do a little research on the science behind the app.

If your app is asking you about your cervical mucus - you should know why and how this relates to conception. Increased egg-white style mucus encourages the sperm to move along. Understanding the basics of the body is important for inputting the information and managing expectations when using these apps.

4. Use the app as a tool but don't rely on it.

It's not clear if apps actually help you get pregnant faster

Fertility apps are a modern method of the old-fashioned "charting," but the research is not there yet to show if they actually speed up getting knocked up. Most fertility apps operate on the basic scientific understanding of the menstrual cycles, but every woman is different. So if you do download, make sure they are a tool in your bag of tricks (along with a healthy organic based diet, regular exercise and good communication with your GP or Fertility Specialist.

Did you use an App to help you conceive (or are you currently using one)? Did you find it helpful?