Typically I start around the 20th of every month, and it last about 5-7 days. My last period started on Aug 26th and lasted until Sept 12th. When should I expect my period again? I'm worried that I could be pregnant & don't know when the best time to test again would be? Thank you!

Sometimes, periods could be weeks late. It happens at times. You should expect your period a month after your last one or the exact date it started the last month. And usually, you can take a test about two weeks after the last time you guys did it. Although, it can take up to a month to show up in HPT tests as well.