Do you have to have sex the day you ovulate ?

Jessica

He is going out of town this weekend, I ovulate this Sunday says the calendar. We can only plan sex today, tomorrow and maybe Thursday morning, i do have ehh white mucus and using baby dance plus other pills to help conceive. Last month we did it the day before I tested positive on test and two days after. I ended up with my period :( he travels. Could it be possible to get pregnant before ovulation day ? Trying to stay positive