Hello, welcome to Healthcaremagic. Sometimes periods can get delayed due to several reasons including mental or physical stress
. If you do not get periods in next 1 week repeat the UPT test. If it still comes out negative visit your gynecologist to ascertain the cause for delay. You must be patient and have sex in fertile period that is between 10 to 18 day of your cycle and you would be able to concieve. Wish you good health.