what are the odds of being pregnant even though 2 tests came up negative?

alright so i am now 3 days late on my period,and have no signs of it coming, my cycle is 29 days long, ive been keeping track of it for the last 4 months.about a week and a half ago i noticed i had tiny spots of blood when i used the bathroom, but it was only for a day. for the last week ive been so nauseous i feel like im about to vomit constantly along with headaches. ive also been completely exhausted, but cant seem to sleep to save my life... the only thing is i took 2 pregnancy tests today and were both negative....but im still 3 days late..can anyone please give me advice if they gone through similar situations.
i didnt take the test in the morning, and i took the second one the same day, about an hour or so after the first one.
 
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