Is it my period?

So until this month my last period was on February 16th. On August 5th I had what I thought was my period. It lasted 7 days but was mostly old blood the whole time and never really needed a pad. On August 19th I began bleeding again except this time it’s all fresh and heavy like normal…. Has this happen to anyone?? If so was the one one the 5th just getting me ready for my actual period?? This hasn’t happen before.