How do you increase the chance of getting pregnant?

The simplest ways are:

1) BOTH live healthy lives: no drugs, no smoking, limited alcohol, varied food and regular excercise.

2) Find out when your ovulation takes place so as to make sure you have intercourse at the right time of your cycle. From the moment the egg is released it can only survive for about 12 hours. A man's semen can survive for 2-3 days which is why it's advised to start having regular intercourse in the days leading up to your ovulation. For the highest quality of semen at least 1 (male) orgasm per day during the week leading up to your ovulation is advised.