This fantastic question just came to us via Twitter!
Answer: To improve your chances getting pregnant you need to make love on your fertile days (aka window). Once a day, every day during your 5-6 fertile days (your fertile days are the 4-5 days before ovulation and the day of ovulation).
In order to find out when your fertile days are you need to begin tracking ovulation. You can do this easily using the Fertility and Ovulation Calendar/Calculator.
We also have this great article which is likely to answer most of the other questions you may have surrounding this issue. If you read the article and still have a question feel free to direct message me anytime or reply to this post!