I'm 25 years old married women. I had period at June 21 and no period until agust 14... It's 25 days late period. I took home pregnancy test at agust 10 and it was negative. I am worrying what must be the reasons behind it?

I recommend going to your primary care physician and getting tested. They will determine if a blood test is necessary. I personally was in the percentage of woman that for accurate results blood testing was it. Stress, new medications and so on can also unregulated your periods. Wish you the best :)