How can I get pregnant immediately?

Regular intercourse. Best way to start is to address and health issues or gynecologic problems, adopt a good diet with prenatal vitamins, moderate exercise, and start having unprotected intercourse before ovulation, d10, 12, 14 of the menstrual cycle for women with regular cycles.
IVF. Depending on your age, hormones, gyn and medical background, there are many different ways to get pregnanct. But if you are asking for the highest pregnancy rate from any method, then ivf (in vitro fertilization) has the highest chance or working quickly.