Hi,
Welcome to Healthcaremagic.
25th day is not a day to consider the cycle end.Even if the cycles are of 25days only regularly there may be chances of one or two days lag .Need not worry and the chances of
pregnancy after a negative test are nil.
Do wait for two to three days if you do not see the periods then you may have to consult a gynaecologist.
Wish you good health.