Had sex just for one day before fertile nor ovulation.could i still get pregnant by not having sex any other day.?

Yes: If you're not trying to conceive and you don't want to be pregnant, you can take post-coital birth control - the "morning after pill" within 3 days after having intercourse, but it works better the sooner you take it. These types of birth control can be up to 89-95% effective. You should not rely on this as your only birth control method - see your OB or family dr or planned parenthood for options.

Yes: It is possible. It depends on the exact time of the month. Sperm can live several days inside the vagina and uterus and up to 7 days in rare cases. So it is possible to have sex then ovulate 3-7 days later and become pregnant. However it is not likely. Most sperm does not last that long in the body.