I'm only new to trying to conceive but one thing I've read is that if you test too early, you can get false negatives (if you are pregnant) and this can be very disappointing.
The best bet is to wait a week after your missed period, take a test and if still negative wait a week further and one way or another either your period will show up, or you will get that positive.
Some tests do say they can give a positive so many days before a due period, or so many days after ovulation but you are really taking a chance.
Some women can get a positive straight away, some women can be pregnant and not get a positive for several weeks into pregnancy. Some women have even said they never get a positive with the urine tests, and only blood tests (through a Dr).
It's all individual!
