well, two month is a pretty long time for a late period..... so i would recomend you taking another test.... have in mind that for some stange reaso it can stil come negative even if you are pregnant. in my first pregnancy, in which i had a misscariage, i had 5 neg, then i went to the doc and took a blood test and cam out pisitive..... so try 2 more tests, one this week, the next week the other, if nothing and your perod still not come you will defenatly have to find a way to go to the doc...... if you are you will show sooner or later and your parents will find out any ways....
GOOD LUCK!!!!!!!