 [ Symptoms ] my girlfriend took 400mg ibuprofen this morning and 400mg tylenol at 6 est can she take either again  migraines and a bit of a tooth ache still from a removed impacted premolar [ Disease ] timing is everything sperm can live for three to five days but the egg is around for only 12 to 24 hours to increase the likelihood of conception it is important to have daily intercourse in the days leading to ovulation and on the day you ovulate a woman typically ovulates about 14 days before her next period if you have a 28 day cycle which is the average then you would ovulate about halfway through your cycle but if you have a 35 day cycle you would ovulate around day 21 not day 17 day 1 is the first day of your period  you can refer some useful tips to get pregnant fast here good luck