Normally, pregnancy tests won’t give you an accurate result until about 14 days after conception – or when you are at least a day late for your next period. For conception to occur, sexual intercourse needs to take place around the time you ovulate. Ovulation occurs in the middle of your cycle (around day 14 if you have a 28-day cycle), or approximately 14 days before your next period. Sperm can live for up to five days in the woman’s body, so there’s potentially about a week around the time of ovulation when you could get pregnant. The rest of the time it is much more unlikely. The least fertile time is the few days before you are due your period. If you think you are pregnant, but get a negative result from a test, wait a few days, then test again. It’s possible to get a negative result when you’re one or two days late for your period, but a strongly positive one when you’re a week late. This is because if you are pregnant, there’s a sharp rise in the levels of the hormone that the test measures during this particular week. Be patient!