[Eternal]

The pull out method is a very unreliable form of birth control. If you're going to be having sex, you need to be safe about it and use a condom. I also want to add that pregnancy tests should be taken when you first go to the bathroom in the morning because that is when the hormones will be most potent, taking it at night is likely to result in a negative because of this.
Remember stress and other variables can delay your period, so if you took tests two weeks after you last had sex and they came up negative then you probably aren't pregnant, but definitely be safe about it in the future. It's just not worth the risk.