The best time to get pregnant fast is to have sex or sexual intercourse once a day every day during the 4-5 days before and on the day of ovulation.
There is no single "best day" or best time to get pregnant and to make love if you want to improve your chances of getting pregnant. Studies have shown repeatedly that you can improve your chances of getting pregnant by:
Calculate the best time to get pregnant and your fertile days HERE
Making love the day after ovulation won't get you pregnant.
To improve your chances of getting pregnant, you need to have sex regularly throughout the menstrual cycle and especially during your fertile days. That requires that you first find out how to calculate your fertile days.
While there is no definitive proof that you always improve your chances of getting pregnant by timing sexual intercourse, it can help if you calculate ovulation and your fertile days by using our fertility calendar, doing BBT fertility charting, and using OPKs, or fertility monitors.
Studies have shown that in women with regular cycles, ovulation can happen on many days of the menstrual cycle and there could be many days not just a single best time to get pregnant. Even in women with a regular cycle, there is a 10% chance of ovulating each day after the menstrual period ends.
Because having sex after ovulation won't get you pregnant, it's generally suggested to have sex regularly two to three times a week, every week. That is your best time to get pregnant to improve your chances of getting pregnant.
In addition, you may still want to make love daily during the four to five "fertile" days prior to and during ovulation (if his sperm count is OK). But if that's all you do, then it won't probably increase your pregnancy chances.