Hello, there is as such no rules about the way intercourse should happen, during the intercourse if semen enters vagina there are always chances of pregnancy. To conceive this intercourse should happen during the fertile period of your cycle generally around 14th day from 1st day of your period, if cycles are regular and of 28 days.

On day of ovulation have relations lie down for 15 Min go to washroom but don't use jet to wash in vagina.