Planning to test on the weekend(Original post by cheshiremum)
This isn't the first post I've seen here with a a similar question. Please - if you're having unprotected sex you're risking more than pregnancy. Think about contraception.
You probably aren't pregnant, but if you are, then you should really wait until 2 weeks after the 19th to do a test. They say the day your period should have started because if you're trying to get pregnant you'd be trying about two weeks before that...and the two weeks are about what it takes for HCG levels to build up enough to be detected. No harm in testing earlier, but probably a waste of money.
Find out how you've done here