I had my period july4 and again july28 is this mormal?

Once a year?: A woman with cycles shorter than 29 days (shorter than 1 month) will likely have 1 menstrual period per month during the year, but will start 2 menstrual periods during one month of each year (since she has about 13 cycles a year). So, from July 4 to 28 is a 24-day cycle... and would be normal is one usually has approximately 24-day cycles.