The National Health Service says that with having sex every 2 to 3 days throughout the month, around 84 in 100 couples will get pregnant within 1 year without the use of any devices. Ava may help pinpoint the best days to have sex, making this process faster. Successful conception is more complicated than the sperm meeting the egg, however. That said, when couples time intercourse precisely with their fertile window and ovulation, 38 percent may conceive in the first month, 68 percent in 3 months, 81 percent in 6 months, and 92 percent after 1 year, according to a 2003 study.