Originally Posted by
Alty
Brown blood is old blood. In other words, blood left in your body, that your body is getting rid of. It's not a period. That's the simplest way I can state it.
Pregnancy is possible. There's no form of birth control that's 100%. If I had a dime for every friend that got pregnant while on the pill, using a condom, and using another form of birth control, I'd be rich.
The only way to prevent pregnancy 100% is to avoid having sex until you're ready to have a child.
You'll have to test. Wait a week, and then test with first morning urine. I'm only saying this because what you describe doesn't sound like a period.