I normally have fairly regular periods that are only one or two days off. However, during the past couple months I've had spotting for one or two days then I get my period a week later. I was supposed to get my period for the month of July arounnd the 25th, however it is now August 12th and I still havent gotten it. I took a pregnancy test (even though a condom was used) which turned up negative, so I was just wondering what other possible reasons there may be. This has not happened to me before so I'm a little concerned. Also, I am not able to see my doctor until August 22nd so I'm just wondering what I could do until then since that's when I should get my next period, but now I'm not so certain.

Thank You.