[Harmony♥]

Stress, along with other factors, can indeed make your period very irregular. Sometimes, it could even make your period stop completely. Due to the fact that you're worried about your period, and volleyball is a strenuous work out, this might be why your period might not have come yet, but then again, it's only the 20th of July. Your last period was the 26th of June. Periods can be very strange, and if you've had irregular periods in the past, this could also add on another factor as to why your period hasn't made it's presence yet.

Stop worrying. You did everything right; you used protection. That's the number one key in making sure an unplanned pregnancy doesn't happen. If you're sure the condom didn't break, the chances of becoming pregnant are very slim.

It's still too early to test. It's only been about 10 days since you last had sex, you should wait another 4 days or so to take a pregnancy test, if anything, just to ease your mind.