Late Period

So last week I had a rib pop out of place (and had to go to the chiropractor to get it popped back in place) three different times and ended up in the ER at one point from pain... this past week was also finals week in college so there's stress there too. I'm sexually active and my period is now late by 8 days. I haven't taken a pregnancy test yet but was just wondering if anyone has experienced this or has had an injury and has been late or what... thanks for your input!!!