Had a Light Period but tests are negative?

[Samantha]

I started my period June 16th but its was light i always have at least one heavy day. and strangely this time i didnt. i was light the time and i usually last about a week and i lasted five days.i took a pregnacy test about ttwo days before that & then i started.then i took one about a week ago an they both came out negative. i have been feeling sleepy.i use the restroom alot more.i pee alot and poo almost everyday. i have headaches that come and go && i get sotmach pains alot...can someone help me out and tell me whats up???