The missionary position followed by relaxing for a short time may be helpful.
Many women immediately go to the restroom to clean themselves following intercourse. This should be avoided because you don’t want to wash the sperm away before it has had it’s opportunity to fertilize the egg.
It can normally take up to a year to conceive, but many factors are involved. If you have regular, monthly cycles you should take prenatal vitamins and see your gynecologist if unable to conceive within a year, but if your cycles are irregular you should see your gynecologist now.