Tmi please help!!

My periods have never looked like this.. Af always heavy.. I had sex on the 22nd of June which was 2days before my fertile window but there's no way.. Turned from a light brown to a pink no blood or nothing.. & my period are regular & always come on time .. It looks like a lot , but it's not even thick , not even wet!! I'm sitting down & I feel like I have something coming out of vagina sorry for tmi , but when i go to the restroom it's dry & nothing's there!! Help? I just had one cramp on the 11th that's when all this started other then that , I have no af cramps.. Mybreast feel heavy & im tired .. I can't eat during the morning or evening just at night ..  I took test they came out negative so idk. Why worry if it's negative ?