I had sex 7/20, i'm on bc, he didn't use a condom but he did pull out.my period is expected between 8/5-8/7, but i'm bloated already. should i worry?

Probably not: Bloating can be caused by many issues other than pregnancy such as constipation, gas, stress, hormone shifts. A person would not have pregnancy symptoms less than a week after sex. If you have been taking your birth control regularly then you have little to worry about. Plan B is still an option for added benefit. 6 days is out of the window of highest effectiveness but it could still work